Gaya APA

Darwin, C, (. ( tthn). The origin of species by means of natural selection of the preservation of favored races in the struggle for life and the descent of man and selection in relation to sex. . New York: Modern Library.

Gaya MLA

Darwin, Ch., (1809-1882).. "The origin of species by means of natural selection of the preservation of favored races in the struggle for life and the descent of man and selection in relation to sex. ". New York: Modern Library, tthn. Buku.