APA (7th ed.) Citation

Marx, K., & Engels, F. (1981). Collected works. Progress Publishers.

Chicago Style (17th ed.) Citation

Marx, Karl, and Frederick;Marx Engels. Collected Works. Progress Publishers, 1981.

MLA (9th ed.) Citation

Marx, Karl, and Frederick;Marx Engels. Collected Works. Progress Publishers, 1981.

Warning: These citations may not always be 100% accurate.