Needham, J. G., & Needham, P. R. (1962). A guide to the study of fresh-water biology (5th ed.). Holden-Day.
Cita Chicago (17th ed.)Needham, James George, i Paul Robert Needham. A Guide to the Study of Fresh-water Biology. 5th ed. San Francisco: Holden-Day, 1962.
Cita MLA (9th ed.)Needham, James George, i Paul Robert Needham. A Guide to the Study of Fresh-water Biology. 5th ed. Holden-Day, 1962.
Atenció: Aquestes cites poden no estar 100% correctes.