APA (7th ed.) Citation

Marx, K., Engels, F., Mortier, J., & Badia, G. (1971). Correspondance: 1849-1851. Paris: Editions Sociales.

Chicago Style (17th ed.) Citation

Marx, Karl, Friedrich Engels, Jean Mortier, and Gilbert Badia. Correspondance: 1849-1851. Paris: Editions Sociales, 1971.

MLA (8th ed.) Citation

Marx, Karl, et al. Correspondance: 1849-1851. Paris: Editions Sociales, 1971.