APA ציטוט

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

Chicago Edition Citation

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

ציטוט MLA

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