Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

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