The origin of species by means of natural selection or the preservation of favoured races in the struggle for life.

MLA

Darwin, Charles. The Origin of Species by Means of Natural Selection Or the Preservation of Favoured Races In the Struggle for Life. New York, N.Y, 1963.

APA

Darwin, C. (1963). The origin of species by means of natural selection or the preservation of favoured races in the struggle for life. New York, N.Y.

Chicago

Darwin, Charles The Origin of Species by Means of Natural Selection Or the Preservation of Favoured Races In the Struggle for Life. New York, N.Y., 1963.