Needham, J., & Needham, P. (1962). A Guide to the study of fresh-water biology (5th ed., rev. and enlarged.). Holden-Day.
Lua i Stíl Chicago (17ú heag.)Needham, James, agus Paul Needham. A Guide to the Study of Fresh-water Biology. 5th ed., rev. and enlarged. San Francisco: Holden-Day, 1962.
Lua MLA (9ú heag.)Needham, James, agus Paul Needham. A Guide to the Study of Fresh-water Biology. 5th ed., rev. and enlarged. Holden-Day, 1962.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.