Cita APA (7th ed.)

Darwin, C. (1872). On the origin of species: By means of natural selection (Sixth edition.). The Floating Press.

Cita Chicago (17th ed.)

Darwin, Charles. On the Origin of Species: By Means of Natural Selection. Sixth edition. [Auckland, New Zealand]: The Floating Press, 1872.

Cita MLA (9th ed.)

Darwin, Charles. On the Origin of Species: By Means of Natural Selection. Sixth edition. The Floating Press, 1872.