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..
Chicago-Zitierstil (17. Ausg.)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.
MLA-Zitierstil (9. Ausg.)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.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.