Cita APA (7th ed.)

DARWIN, C. (1872). The Origin of species. 0.U.Pr.

Cita Chicago (17th ed.)

DARWIN, Charles. The Origin of Species. London: 0.U.Pr, 1872.

Cita MLA (9th ed.)

DARWIN, Charles. The Origin of Species. 0.U.Pr, 1872.