Cita APA (7a ed.)

Marx, K., & Engels, F. (1931). Correspondance. Alfred Costes.

Cita Chicago Style (17a ed.)

Marx, Karl, y Friedrich Engels. Correspondance. Paris: Alfred Costes, 1931.

Cita MLA (9a ed.)

Marx, Karl, y Friedrich Engels. Correspondance. Alfred Costes, 1931.