Bird, W. (1991). The orgin of species revisited: The theories of evolution and of abrupt appearance. Regency.
Citace podle Chicago (17th ed.)Bird, W.R. The Orgin of Species Revisited: The Theories of Evolution and of Abrupt Appearance. Tennessee: Regency, 1991.
Citace podle MLA (9th ed.)Bird, W.R. The Orgin of Species Revisited: The Theories of Evolution and of Abrupt Appearance. Regency, 1991.
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