APA (7th ed.) Citation

Marx, K., & Engels, F. The civil war in the United States. International publishers (New York).

Chicago Style (17th ed.) Citation

Marx, Karl, and Friedrich Engels. The Civil War in the United States. International publishers (New York).

MLA (8th ed.) Citation

Marx, Karl, and Friedrich Engels. The Civil War in the United States. International publishers (New York).

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