Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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