Παραπομπή APA

Fry, W. [. (1970). Biology of the porifera. Zoological Society of London.

Παραπομπή Chicago Style

Fry, W.G. [ed.]. Biology of the Porifera. London: Zoological Society of London, 1970.

Παραπομπή MLA

Fry, W.G. [ed.]. Biology of the Porifera. Zoological Society of London, 1970.