The origin of species by means of natural selection, or, The preservation of favored races in the struggle for life /
Charles Darwin.

APA Citation

Darwin, C. (1993). 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.

MLA Citation

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, 1993.

Warning: These citations may not always be complete (especially for serials).