Needham, J., & Needham, P. (1962). A Guide to the study of fresh-water biology (5th ed., rev. and enlarged.). Holden-Day.
Chicago-referens (17:e uppl.)Needham, James, och Paul Needham. A Guide to the Study of Fresh-water Biology. 5th ed., rev. and enlarged. San Francisco: Holden-Day, 1962.
MLA-referens (9:e uppl.)Needham, James, och Paul Needham. A Guide to the Study of Fresh-water Biology. 5th ed., rev. and enlarged. Holden-Day, 1962.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.