APA (7th ed.) Citation

Marx, K., & Marx-Aveling, E. (1899). Secret diplomatic history of the eighteenth century.

Chicago Style (17th ed.) Citation

Marx, Karl, and Eleanor Marx-Aveling. Secret Diplomatic History of the Eighteenth Century. 1899.

MLA (8th ed.) Citation

Marx, Karl, and Eleanor Marx-Aveling. Secret Diplomatic History of the Eighteenth Century. 1899.

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