Παραπομπή APA

Fry, W. G. (1970). Biology of the porifera: : symposia of the zoological society of london 25. Academic press.

Παραπομπή Chicago Style

Fry, W. G. Biology of the Porifera: : Symposia of the Zoological Society of London 25. New York: Academic press, 1970.

Παραπομπή MLA

Fry, W. G. Biology of the Porifera: : Symposia of the Zoological Society of London 25. Academic press, 1970.