Dyfyniad APA

Darwin, C., & Kelchner, C. (2008). The origin of species (1st Pocket Books pbk. ed.). Pocket Books.

Dyfyniad Arddull Chicago

Darwin, Charles, and Charlotte Kelchner. The Origin of Species. 1st Pocket Books pbk. ed. New York: Pocket Books, 2008.

Dyfyniad MLA

Darwin, Charles, and Charlotte Kelchner. The Origin of Species. 1st Pocket Books pbk. ed. Pocket Books, 2008.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.