APA (7. basım) Alıntı
Engels, F. (2001). The Part played by labour in the transition from ape to man. Electric Book Co..
Chicago Style (17. basım) Atıf
Engels, Friedrich. The Part Played by Labour in the Transition from Ape to Man. London: Electric Book Co., 2001.
MLA (9th ed.) Atıf
Engels, Friedrich. The Part Played by Labour in the Transition from Ape to Man. Electric Book Co., 2001.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..