APA (7th ed.) Citation

Marx, K., & Engels, F. (1968). Selected works [of] Karl Marx and Frederick Engels. Progress.

Chicago Style (17th ed.) Citation

Marx, Karl, and Friedrich Engels. Selected Works [of] Karl Marx and Frederick Engels. Moscow: Progress, 1968.

MLA (9th ed.) Citation

Marx, Karl, and Friedrich Engels. Selected Works [of] Karl Marx and Frederick Engels. Progress, 1968.