APA-referens (7:e uppl.)

Engels, F. (1989). Socialism: Utopian and scientific. Pathfinder.

Chicago-referens (17:e uppl.)

Engels, Frederick. Socialism: Utopian and Scientific. New York: Pathfinder, 1989.

MLA-referens (9:e uppl.)

Engels, Frederick. Socialism: Utopian and Scientific. Pathfinder, 1989.