Cita APA (7th ed.)

Bird, W. (1991). The orgin of species revisited: The theories of evolution and of abrupt appearance. Regency.

Cita Chicago (17th ed.)

Bird, W.R. The Orgin of Species Revisited: The Theories of Evolution and of Abrupt Appearance. Tennessee: Regency, 1991.

Cita MLA (9th ed.)

Bird, W.R. The Orgin of Species Revisited: The Theories of Evolution and of Abrupt Appearance. Regency, 1991.