Cita APA (7th ed.)

Darwin, C. (1872). The Origin of species (6th ed.). 0.U.Pr.

Cita Chicago (17th ed.)

Darwin, Charles. The Origin of Species. 6th ed. London: 0.U.Pr, 1872.

Cita MLA (9th ed.)

Darwin, Charles. The Origin of Species. 6th ed. 0.U.Pr, 1872.