APA (7th ed.) Citation

Rühle, O., Paul, E., & Paul, C. (1929). Karl Marx: His life and work. The Viking press.

Chicago Style (17th ed.) Citation

Rühle, Otto, Eden Paul, and Cedar Paul. Karl Marx: His Life and Work. New York: The Viking press, 1929.

MLA (8th ed.) Citation

Rühle, Otto, et al. Karl Marx: His Life and Work. The Viking press, 1929.