APA استشهاد

Marx,Karl, & Engels,Frederick. (1980). Karl Marx Frederick Engels: Collected works. Progress Publishers.

استشهاد بنمط شيكاغو

Marx,Karl, و Engels,Frederick. Karl Marx Frederick Engels: Collected Works. Moscow: Progress Publishers, 1980.

MLA استشهاد

Marx,Karl, و Engels,Frederick. Karl Marx Frederick Engels: Collected Works. Progress Publishers, 1980.