APA (7th ed.) Citation

Marx, K., & Engels, F. (1971). Werke Werke.

Chicago Style (17th ed.) Citation

Marx, Karl, and Friedrich Engels. "Werke." Werke 1971.

MLA (8th ed.) Citation

Marx, Karl, and Friedrich Engels. "Werke." Werke, 1971.

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