APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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