Cita APA

Darwin, C. R. (1980). The origin of species, by means of natural selection ; The descent of man, and selection in relation to sex (23th print.). Chicago: Encyclopaedia Britannica.

Citación estilo Chicago

Darwin, Charles Robert. The Origin of Species, By Means of Natural Selection ; The Descent of Man, and Selection in Relation to Sex. 23th print. Chicago: Encyclopaedia Britannica, 1980.

Cita MLA

Darwin, Charles Robert. The Origin of Species, By Means of Natural Selection ; The Descent of Man, and Selection in Relation to Sex. 23th print. Chicago: Encyclopaedia Britannica, 1980.