Pennak, R. W. (1953). Fresh-water invertebrates of the United States. The Ronald Press.
Chicago Style (17. basım) AtıfPennak, Robert W. Fresh-water Invertebrates of the United States. New York: The Ronald Press, 1953.
MLA (9th ed.) AtıfPennak, Robert W. Fresh-water Invertebrates of the United States. The Ronald Press, 1953.
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