APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

Warning: These citations may not always be 100% accurate.