Darwin, C. (1996). The origin of species by means of natural selection: The descent of man and selection in relation to sex (2nd, 6th print.). Encyclopædia Britannica.
Cytowanie według stylu Chicago (wyd. 17)Darwin, Charles. The Origin of Species by Means of Natural Selection: The Descent of Man and Selection in Relation to Sex. 2nd, 6th print. Chicago: Encyclopædia Britannica, 1996.
Cytowanie według stylu MLA (wyd. 9)Darwin, Charles. The Origin of Species by Means of Natural Selection: The Descent of Man and Selection in Relation to Sex. 2nd, 6th print. Encyclopædia Britannica, 1996.
Uwaga: Te cytaty mogą odróżniać się od wytycznej twojego fakultetu..