{{sfn|Perrin|Armarego|1988|p=}}
* {{cite book | last=Perrin | first=D. D. | last2=Armarego | first2=W. L. F. | title=Purification of laboratory chemicals | publisher=Pergamon Press | publication-place=Oxford ; New York | date=1988 | isbn=978-0-08-034714-1}}
<ref name="x721">{{cite book | last=Perrin | first=D. D. | last2=Armarego | first2=W. L. F. | title=Purification of laboratory chemicals | publisher=Pergamon Press | publication-place=Oxford ; New York | date=1988 | isbn=978-0-08-034714-1 | page=}}</ref>