Citazione APA

Reitner, J., & Keupp, H. (1991). Fossil and recent sponges. Springer.

Stile di citazione Chicago

Reitner, J., e H. Keupp. Fossil and Recent Sponges. New York: Springer, 1991.

Citazione MLA

Reitner, J., e H. Keupp. Fossil and Recent Sponges. Springer, 1991.