APA (7th ed.) Citation

Marx, K., Lenin, V. I., & Kugelmann, L. (1948). Briefe an Kugelmann. Dietz.

Chicago Style (17th ed.) Citation

Marx, Karl, Vladimir Ilʹič Lenin, and Louis Kugelmann. Briefe an Kugelmann. Berlin: Dietz, 1948.

MLA (8th ed.) Citation

Marx, Karl, et al. Briefe an Kugelmann. Dietz, 1948.