Não informado. (1936). Frontiers: A magazine of natural history. Academy of Natural Sciences of Philadelphia.
Citace podle Chicago (17th ed.)Não informado. Frontiers: A Magazine of Natural History. Philadelphia, Pa: Academy of Natural Sciences of Philadelphia, 1936.
Citace podle MLA (8th ed.)Não informado. Frontiers: A Magazine of Natural History. Academy of Natural Sciences of Philadelphia, 1936.
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