APA Style

Darwin, C, 1. (1998). The origin of species : by means of natural selection or the preservation of favored races in the struggle for life (Modern Library ed.). New York: Modern Library Paperback.

MLA Style

Darwin, Charles,, 1809-1882. "The origin of species : by means of natural selection or the preservation of favored races in the struggle for life". Modern Library ed. New York: Modern Library Paperback, 1998. Text.