APA (7th ed.) Citation

Marx, K., & Engels, F. (1961). Werke Werke.

Chicago Style (17th ed.) Citation

Marx, Karl, and Friedrich Engels. "Werke." Werke 1961.

MLA (9th ed.) Citation

Marx, Karl, and Friedrich Engels. "Werke." Werke, 1961.

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