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..
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 ed., 5th print. Chicago, Ill [etc.]: Encyclopaedia Britannica, Inc., 1994.
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 ed., 5th print. Encyclopaedia Britannica, Inc., 1994.
Uwaga: Te cytaty mogą odróżniać się od wytycznej twojego fakultetu..