Cita APA (7th ed.)

Pennak, R. . W. (1953). Fresh-water invertebrates of the United States. Wiley.

Cita Chicago (17th ed.)

Pennak, Robert W. Fresh-water Invertebrates of the United States. New York: Wiley, 1953.

Cita MLA (9th ed.)

Pennak, Robert W. Fresh-water Invertebrates of the United States. Wiley, 1953.