Cita APA (7th ed.)

Engels, F., Lafargue, P., & Lafargue, L. (1959). Correspondence. Foreign Languages Publishing House.

Cita Chicago (17th ed.)

Engels, Friedrich, Paul Lafargue, i Laura Lafargue. Correspondence. Moscow: Foreign Languages Publishing House, 1959.

Cita MLA (8th ed.)

Engels, Friedrich, et al. Correspondence. Foreign Languages Publishing House, 1959.