Marx, K., Engels, F., Badia, G., Mortier, J., Bernhard, G., Chabbert, J., . . . Verger, J. (1972). Correspondance. Editions sociales.
Lua i Stíl Chicago (17ú heag.)Marx, Karl, et al. Correspondance. Paris: Editions sociales, 1972.
Lua MLA (8ú heag.)Marx, Karl, et al. Correspondance. Editions sociales, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.