Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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