Bird, W. (1991). The orgin of species revisited: The theories of evolution and of abrupt appearance. Regency.
Чикаго-гийн эшлэл (17 дахь хэвлэлт)Bird, W.R. The Orgin of Species Revisited: The Theories of Evolution and of Abrupt Appearance. Tennessee: Regency, 1991.
MLA -ийн эшлэл (9 дэх хэвлэлт)Bird, W.R. The Orgin of Species Revisited: The Theories of Evolution and of Abrupt Appearance. Regency, 1991.
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