- "Abel," in Collier's New Encyclopedia, New York: P. F. Collier & Son Co. (1921)
- "Abel (1)," in Catholic Encyclopedia, (ed.) by Charles G. Herbermann and others, New York: The Encyclopaedia Press (1913)
- "Abel (2)," in Catholic Encyclopedia, (ed.) by Charles G. Herbermann and others, New York: The Encyclopaedia Press (1913)
- "Abel," in Easton's Bible Dictionary (1897)
- "Abel," in Encyclopædia Britannica (11th ed., 1911)
- "Abel," in The New Student's Reference Work, Chicago: F.E. Compton and Co. (1914)
- "Abel (d.764)," in Dictionary of National Biography, 1885-1900, London: Smith, Elder, & Co. (1885–1900) in 63 vols.