APA

Burnett A. L., . (1973). Biology of hydra. New York [u.a.]: Acad. Press.

Chicago

Burnett Allison L, . 1973. Biology of hydra. New York [u.a.]: Acad. Press.

Harvard

Burnett A. L., . (1973). Biology of hydra. New York [u.a.]: Acad. Press.

MLA

Burnett Allison L, . Biology of hydra. New York [u.a.]: Acad. Press. 1973.