Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

Pennak, Robert W. Fresh-water Invertebrates of the United States. The Ronald Press, 1953.