https://www.scirp.org/reference/ReferencesPapers?ReferenceID=1727198
Marx, K. (2012). Economic and Philosophic Manuscripts of 1844. Courier Corporation.
marxkeconomicphilosophicmanuscripts
https://www.marxists.org/francais/marx/works/1847/06/km18470615m.htm
John Gray et les bons du travail - K. Marx
john grayles bonsk marxetdu
https://www.scirp.org/reference/ReferencesPapers?ReferenceID=1727197
Marx, K. (1990). Religion, the Opium of the People. The World Treasury of Modern Religious Thought, 79-91.
marxkreligionopiumpeople