APA

Fry W. G., . (1970). The biology of the porifera. New York: The Zoological Society of Londonacademic Press.

Chicago

Fry W G, . 1970. The biology of the porifera. New York: The Zoological Society of Londonacademic Press.

Harvard

Fry W. G., . (1970). The biology of the porifera. New York: The Zoological Society of Londonacademic Press.

MLA

Fry W G, . The biology of the porifera. New York: The Zoological Society of Londonacademic Press. 1970.