Cita APA (7a ed.)
Engels, F. (2001). The Part played by labour in the transition from ape to man. Electric Book Co..
Cita Chicago Style (17a ed.)
Engels, Friedrich. The Part Played by Labour in the Transition from Ape to Man. London: Electric Book Co., 2001.
Cita MLA (9a ed.)
Engels, Friedrich. The Part Played by Labour in the Transition from Ape to Man. Electric Book Co., 2001.
Precaución: Estas citas no son 100% exactas.