APA (7th ed.) Citation

Marx, K., Engels, F., & Trachtenberg, A. (1953). Karl Marx and Frederick Engels: Letters to Americans, 1848-1895; a selection. International Publishers.

Chicago Style (17th ed.) Citation

Marx, Karl, Friedrich Engels, and Alexander Trachtenberg. Karl Marx and Frederick Engels: Letters to Americans, 1848-1895; a Selection. New York: International Publishers, 1953.

MLA (9th ed.) Citation

Marx, Karl, et al. Karl Marx and Frederick Engels: Letters to Americans, 1848-1895; a Selection. International Publishers, 1953.