Marx & Engels collected works
MLA
Marx, Karl, and Friedrich Engels. Marx & Engels Collected Works. Baltimore, MD: Project Muse, 2015
APA, 7th edition
Marx, K., & Engels, F. (2015). Marx & Engels collected works. Baltimore, MD: Project Muse
Chicago, 17th edition
Marx, Karl, and Friedrich Engels. Marx & Engels collected works. 0 vols. Baltimore, MD: Project Muse, 2015