APA-referens

Engels, F. (1949). The Part played by labour in the transition from ape to man.

Chicago-stil citat

Engels, Friedrich. The Part Played by Labour in the Transition from Ape to Man. Moscow, 1949.

MLA-referens

Engels, Friedrich. The Part Played by Labour in the Transition from Ape to Man. 1949.

Varning: dessa hänvisningar är inte alltid fullständigt riktiga.