APA-referens (7:e uppl.)
Bird, W. (1991). The orgin of species revisited: The theories of evolution and of abrupt appearance. Regency.
Chicago-referens (17:e uppl.)
Bird, W.R. The Orgin of Species Revisited: The Theories of Evolution and of Abrupt Appearance. Tennessee: Regency, 1991.
MLA-referens (9:e uppl.)
Bird, W.R. The Orgin of Species Revisited: The Theories of Evolution and of Abrupt Appearance. Regency, 1991.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.