McLellan, D. (1972). Marx before Marxism. Penguin.
Cita Chicago (17th ed.)McLellan, David. Marx Before Marxism. Middlesex: Penguin, 1972.
Cita MLA (9th ed.)McLellan, David. Marx Before Marxism. Penguin, 1972.
Atenció: Aquestes cites poden no estar 100% correctes.