APA Edition Citation

Pennak, R. W. (1953). Freshwater invertebrates of the United states.

Chicago Edition Citation

Pennak, Robert W. Freshwater Invertebrates of the United States. Ronald Press Co., New York, 1953.

MLA Edition Citation

Pennak, Robert W. Freshwater Invertebrates of the United States. 1953.

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