Bird, W. (1991). The orgin of species revisited: The theories of evolution and of abrupt appearance. Regency.
Lua i Stíl Chicago (17ú heag.)Bird, W.R. The Orgin of Species Revisited: The Theories of Evolution and of Abrupt Appearance. Tennessee: Regency, 1991.
Lua MLA (9ú heag.)Bird, W.R. The Orgin of Species Revisited: The Theories of Evolution and of Abrupt Appearance. Regency, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.