APA استشهاد

Karl Marx & Frederick Engels. (1980). Karl Marx Frederick Engels: Collected works (v.13). Lawrance and Wishant.

استشهاد بنمط شيكاغو

Karl Marx و Frederick Engels. Karl Marx Frederick Engels: Collected Works (v.13). London: Lawrance and Wishant, 1980.

MLA استشهاد

Karl Marx و Frederick Engels. Karl Marx Frederick Engels: Collected Works (v.13). Lawrance and Wishant, 1980.