APA-Zitierstil (7. Ausg.)

Pennak, R. W. (1991). Fresh-water invertebrates of the United States: Protozoa to Mollusca (3. ed.). Wiley.

Chicago-Zitierstil (17. Ausg.)

Pennak, Robert W. Fresh-water Invertebrates of the United States: Protozoa to Mollusca. 3. ed. New York [u.a.]: Wiley, 1991.

MLA-Zitierstil (9. Ausg.)

Pennak, Robert W. Fresh-water Invertebrates of the United States: Protozoa to Mollusca. 3. ed. Wiley, 1991.