Cotter, A. C. (1947). Natural species: An essay in definition and classification. Weston College Press.
Citace podle Chicago (17th ed.)Cotter, A. C. Natural Species: An Essay in Definition and Classification. Weston, Mass.: Weston College Press, 1947.
Citace podle MLA (8th ed.)Cotter, A. C. Natural Species: An Essay in Definition and Classification. Weston College Press, 1947.
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