Lichtheim, G. (1982). Marxism, an historical and critical study =: Marxismo un estudio crítico e histórico. Columbia University Press.
Lua i Stíl Chicago (17ú heag.)Lichtheim, George. Marxism, an Historical and Critical Study =: Marxismo Un Estudio Crítico E Histórico. New York: Columbia University Press, 1982.
Lua MLA (9ú heag.)Lichtheim, George. Marxism, an Historical and Critical Study =: Marxismo Un Estudio Crítico E Histórico. Columbia University Press, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.