Παραπομπή APA

Darwin, C. (1967). On the origin of spiecies. Athencum.

Παραπομπή Chicago Style

Darwin, C. On the Origin of Spiecies. New York: Athencum, 1967.

Παραπομπή MLA

Darwin, C. On the Origin of Spiecies. Athencum, 1967.