APA (7th ed.) Citation

Marx, K., Engels, F., & Enmale, R. (1937). The civil war in the United States. International Publishers.

Chicago Style (17th ed.) Citation

Marx, Karl, Friedrich Engels, and Richard Enmale. The Civil War in the United States. New York: International Publishers, 1937.

MLA (9th ed.) Citation

Marx, Karl, et al. The Civil War in the United States. International Publishers, 1937.