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https://www.nytimes.com/1962/08/07/archives/ettore-verna-dies-met-singers-coach.html

• Bordman, Gerald (1996). American Theatre: A Chronicle of Comedy and Drama, 1930-1969. Oxford University Press. p. 184. ISBN 9780195358087.

• Saerchinger, César, ed. (1918). "Sulli, Giorgio M.". International Who's Who In Music and Musical Gazetteer: A Contemporary Biographical Dictionary and a Record of the World's Musical Activity. Current Literature Publishing Company.

https://www.nytimes.com/1960/06/06/archives/amy-ellerman-sbhjer-teacher-contralto-who-was-voice-coach-to-irene.html

Elizabeth Forbes (2002). "Cunitz, Maud". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O901156.

David Cummings; Irina Boga (2002). "Ţurcanu-Bercescu, Lucia". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O005135.

David Cummings (2002). "Steingruber, Ilona". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O009431.

Aida Islam (2014). "Firfova, Danka". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.2270788.

Péter P. Várnai (2002). "Gyurkovics, Mária". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O007766.

Richard LeSueur (2002). "Jordan, Irene". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O007454.

Elizabeth Forbes (2002). "Bunlet, Marcelle". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O008515.

Virko Baley (2002). "Petrusenko [Borodavkina], Oxana Andriïvna". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O903881.

Péter P. Várnai (2002). "Báthy, Anna". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O900464.

Cori Ellison (2002). "Somigli, Franca [Clark, Marion Bruce ]". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O009230.

Richard Capell; Elizabeth Forbes (2002). "Eadie, Noël". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O003617.

Elizabeth Forbes (2002). "Ebers, Clara". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O003262.

J. B. Steane (2002). "Giani, Nini". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O901900.

Nadia Turbide (2015). "Johnson (Severns), Theodate". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.A2284733.

David Cummings (2002). "Carena, Maria". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O007663.

I.M. Yampol′sky (2002). "Stepanova, Yelena Andreyevna". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.26691.

David Cummings (2002). "Bindernagel, Gertrud". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O900570.

Cori Ellison (2002). "Bindernagel, Gertrud". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O008645.

David Cummings (2002). "Pasini, Laura". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O005053.

https://www.encyclopedia.com/arts/dictionaries-thesauruses-pictures-and-press-releases/pasini-laura

J.B. Steane (2002). "Saraceni, Adelaide". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O008647.

J.B. Steane (2002). "Oltrabella, Augusta". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O002136.

J.B. Steane (2002). "Nežádal, Maria". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O007503.

Alan Jefferson (2001). "Labbette, Dora [Perli, Lisa]". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.15752.

William A. Everett (2012). "Herbert [Hostetter; Houstellier], Evelyn". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.A2224576.

Elizabeth Forbes; Arnolds Klotiņš (2002). "Vāne, Alīda". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O003829.

Susan Feder (2013). "Lawrence, Dorothea Dix". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.A2242084.

Irina Boga (2013). "Florescu, Arta". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.2280429.

Xoán M. Carreira (2002). "Nache [née Rodríguez-Nache], María-Luísa". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O006083.

Elizabeth Forbes (2002). "Garcisanz, Isabel". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O011469.

Elizabeth Forbes (2002). "Fabbri, Franca". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O901530.

Elizabeth Forbes (2002). "Wilson, Catherine". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O004413.

Elizabeth Forbes (2002). "Bosabalian, Luisa". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O900629.

Max Loppert (2002). "Curphey, Margaret". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O901161.

Irina Boga (2002). "Slătinaru-Nistor, Maria". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O008610.

Elizabeth Forbes; Kathleen Sewright (2013). "Haywood, Lorna (Marie )". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.A2241483.

Elizabeth Forbes (2002). "Azuma, Atsuko". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O008064.

Elizabeth Forbes (2002). "Stapp, Olivia". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O011018.

Elizabeth Forbes (2002). "Koszut, Urszula". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O005152.

David Cummings (2002). "Mathes, Rachel". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O903296.

Elizabeth Forbes (2002). "Andersson, Laila". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O003134.

David Cummings (2002). "Barrera [De Curtis], Giulia". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O900440.

Elizabeth Forbes (2002). "Fine, Wendy". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O901523.

Elizabeth Forbes (2002). "Aruhn, Britt-Marie". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O004028.

Elizabeth Forbes (2001). "Wise, Patricia". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.41984.

Elizabeth Forbes (2001). "Cahill, Teresa". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O003391.

Irina Boga (2015). "Moldoveanu, Eugenia". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O006176.

Noël Goodwin (2015). "Doese, Helena". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O008810.

John Haag. "Musi, Maria Maddalena (1669–1751)". Women in World History: A Biographical Encyclopedia.

Paola Besutti (2001). "Musi [Degli Antoni], Maria Maddalena ['La Mignatti', 'La Mignatta']". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.40873.

Olive Baldwin; Thelma Wilson (2001). "Ayliff [Aylif, Alyff, Ayloff, Ayloffe], Mrs". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.01616.

Paola Besutti (2002). "Venturini, Clarice Beni". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O005202.

Philip Weller (2002). "Saint-Christophle [Saint-Christophe], Mlle de". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O005531.

Colin Timms (2002). "Pini, Maria Domenica". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O008213.

Paola Besutti; Colin Timms (2002). "Torri [Torri Cecchi], Anna Maria ['La Beccarina']". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O905039.

Hans Joachim Marx (2002). "Puchon [Pichon, Pigeon], Madame". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O007522.

Winton Dean (2001). "Azzolini, Caterina". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.40871.

Winton Dean (2001). "Croce, Elena [Viviani, Elena Croce]". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.06847.

Winton Dean (2001). "Casarini, Domenica". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.05067.

Winton Dean (2001). "Galerati, Caterina". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.10522.

Winton Dean (2001). "Monza, Maria". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.19047.

Milan Poštolka (2001). "Hatašová, Anna Franziska [Frantziska, Františka] [née Benda]". Grove Music Online. Oxford University Press. doi:10.1093/omo/9781561592630.013.90000380955.

Hans Joachim Marx (2002). "Kayser, Sophie Amalia". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O009575.

Winton Dean (2001). "Sorosina [Soresina], Benedetta". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.26264.

Dennis Libby (2002). "Facchinelli, Lucia". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O003288.

Olive Baldwin; Thelma Wilson (2002). "Wright, Mrs". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O905681.

Dieter Härtwig (2002). "Westenholz, Barbara Lucietta Fricemelica [Frizemelica] [née Affabili]". Grove Music Online. Oxford University Press. doi:10.1093/omo/9781561592630.013.90000381524.

Franco Piperno (2002). "Isola, Anna". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O902307.

Franco Piperno (2002). "Magagnoli, Maria Ginevra". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O007894.

https://www.google.com/books/edition/Großes_Sängerlexikon/dsfq_5dFeL0C?hl=en&gbpv=1&dq=%22Koulhaas,+Christina%22&pg=PA2475&printsec=frontcover

Hans Joachim Marx (2002). "Koulhaas, Christina Louisa". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O005375.

https://www.biellaclub.it/_cultura/Rivista-Biellese/2009-aprile/Galazzo.pdf

David Cummings (2002). "Astrua, Giovanna". Grove Music Online. Oxford University Press. doi:https://doi.org/10.1093/gmo/9781561592630.article.O004616. {{cite encyclopedia}}: Check |doi= value (help); External link in |doi= (help)

Dennis Libby (2002). "Aschieri, Catterina". Grove Music Online. Oxford University Press. doi:https://doi.org/10.1093/gmo/9781561592630.article.O900262. {{cite encyclopedia}}: Check |doi= value (help); External link in |doi= (help)

https://www.treccani.it/enciclopedia/aschieri-caterina-detta-la-romanina_(Dizionario-Biografico)/

Hans Joachim Marx (2002). "Sellin [Selle], Mlle". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O008328.

Philip Weller (2002). "Armand, Mlle". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O007776.

Olive Baldwin; Thelma Wilson (2002). "Norris, Elizabeth". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O003478.

Colin Timms (2002). "Orlandi, Chiara h". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O002135.

Colin Timms (2002). "Pellizari, Antonia ['La Tonina' ]". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O008211.

Franco Piperno (2002). "Mellini Scalabrini [née Mellini], Grazia". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O007918.

Philip Weller (2002). "Petitpas, Mlle". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O006602.

Hans Joachim Marx (2002). "Eisentraut, Madame". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O007674.

Dennis Libby (2002). "Mattei, Colomba". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O008482.

Philip Weller (2009). "Eremans [Erremans, Heremance], Mlle". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O006856.

Winton Dean (2001). "Sibilla [Gronamann, Sybilla; Mrs Pinto]". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.25691.

Winton Dean (2001). "Salvai, Maria Maddalena". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.24428.

Dennis Libby (2001). "Mattei, Colomba". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O008482.

Philip Weller (2001). "Eremans [Erremans, Heremance], Mlle". Grove Music Online. Oxford University Press. doi:10.1093/gmo/9781561592630.article.O006856.