APA (7th ed.) Citation

Lenhoff, H. M. (1983). Hydra: Research methods. Plenum Press.

Chicago Style (17th ed.) Citation

Lenhoff, Howard M. Hydra: Research Methods. New York [u.a.]: Plenum Press, 1983.

MLA (9th ed.) Citation

Lenhoff, Howard M. Hydra: Research Methods. Plenum Press, 1983.