Παραπομπή APA

Burnett, A. L. (1973). Biology of hydra. Academic press.

Παραπομπή Chicago Style

Burnett, Allison L. Biology of Hydra. New York: Academic press, 1973.

Παραπομπή MLA

Burnett, Allison L. Biology of Hydra. Academic press, 1973.