APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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