APA (7th ed.) Citation

Marx, K., & Aveling, E. M. (2010). Secret Diplomatic History of The Eighteenth Century. Project Gutenberg.

Chicago Style (17th ed.) Citation

Marx, Karl, and Eleanor Marx Aveling. Secret Diplomatic History of The Eighteenth Century. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Marx, Karl, and Eleanor Marx Aveling. Secret Diplomatic History of The Eighteenth Century. Project Gutenberg, 2010.

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