Von Westphalen, J., Marx, K., & Engels, F. Cartas a Kugelmann.
Chicago Style (17th ed.) CitationVon Westphalen, Jenny, Karl Marx, and Federico Engels. Cartas a Kugelmann.
MLA (8th ed.) CitationVon Westphalen, Jenny, et al. Cartas a Kugelmann.
Warning: These citations may not always be 100% accurate.