Cita APA (7th ed.)

Darwin, C. (1951). On the origin of species by means of natural selection; or, The preservation of favoured races in the struggle for life. Philosophical Library.

Cita Chicago (17th ed.)

Darwin, Charles. On the Origin of Species by Means of Natural Selection; or, The Preservation of Favoured Races in the Struggle for Life. New York: Philosophical Library, 1951.

Cita MLA (9th ed.)

Darwin, Charles. On the Origin of Species by Means of Natural Selection; or, The Preservation of Favoured Races in the Struggle for Life. Philosophical Library, 1951.