Citazione Stile APA (7a Edizione)

Darwin, C. (1994). The origin of species by means of natural selection: The descent of man and selection in relation to sex (2nd ed., 5th print.). Encyclopaedia Britannica, Inc..

Citazione stile Chigago Style (17a edizione)

Darwin, Charles. The Origin of Species by Means of Natural Selection: The Descent of Man and Selection in Relation to Sex. 2nd ed., 5th print. Chicago, Ill [etc.]: Encyclopaedia Britannica, Inc., 1994.

Citatione MLA (9a ed.)

Darwin, Charles. The Origin of Species by Means of Natural Selection: The Descent of Man and Selection in Relation to Sex. 2nd ed., 5th print. Encyclopaedia Britannica, Inc., 1994.