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

APA Citation

Darwin, C. (1884). The origin of species by means of natural selection: or the preservation of favored races in the struggle for life. New York: The Humboldt Publishing Co..

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. New York: The Humboldt Publishing Co., 1884.

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