APA (7th ed.) Citation

Krüger, A., Engels, F., & Marx, K. (1988). 1839-1844.

Chicago Style (17th ed.) Citation

Krüger, Anni, Friedrich Engels, and Karl Marx. 1839-1844. 1988.

MLA (8th ed.) Citation

Krüger, Anni, et al. 1839-1844. 1988.

Warning: These citations may not always be 100% accurate.