APA (7th ed.) Citation

Marx, K., Engels, F., & Marx, K. (1968). [Über Kunst., 2]. Dietz.

Chicago Style (17th ed.) Citation

Marx, Karl, Friedrich Engels, and Karl Marx. [Über Kunst., 2]. Berlin: Dietz, 1968.

MLA (8th ed.) Citation

Marx, Karl, et al. [Über Kunst., 2]. Dietz, 1968.