Marx, Karl; Engels, Friedrich (2002). «3. I. a. Feudal Socialism»(paperback). En Jones, Gareth Stedman, ed. The Communist Manifesto (New edición). London: Penguin Group. pp. 246-247. ISBN978-0-140-44757-6. Consultado el 10 de marzo de 2015.
Whyte, Jessica (2016). «'Man Produces Universally': Praxis and Production in Agemben and Marx». En McLoughlin, ed. Agamben and Radical Politics. Critical Connections. Edinburgh: Edinburgh University Press. p. 72. ISBN9781474402651. Consultado el 4 de diciembre de 2021. «[...] Leszek Kolakowski's attack on Marxism as a caricature of religion which 'presents its temporal eschatology as a scientific system' [...].»
Defining Religion in Operational and Institutional Terms, by A Stephen Boyan, Jr., Accessed 4-1-2010 - "The term 'religion' as used today might include almost any kind of ultimate concern with or without an act of personal commitment. The Communist, certainly, is grasped by an ultimate concern which for him is a matter of life or seath, not only personally but also theoretically in terms of his own insignificance, his not-being and worthlessness except [as] he participate[s] in the realization of his Messianic age, his classless society." - Quoting Harold Stahmer: "Defining Religion: Federal Aid and Academic Freedom", in Religion and the Public Order, pages 116 and 128-129 (edited by Donald A. Gianella, 1963).
Representations of Place: Albania, Derek R. Hall, The Geographical Journal, Vol. 165, No. 2, The Changing Meaning of Place in Post-Socialist Eastern Europe: Commodification, Perception and Environment (Jul., 1999), pp. 161–172, Blackwell Publishing on behalf of The Royal Geographical Society (with the Institute of British Geographers)
Engels, Friedrich (1970) [1880]. Socialism: Utopian and Scientific. Marx/Engels Selected Works. III. Moscow: Progress Publishers. pp. 95–151. Retrieved 1 October 2020 – via Marxists Internet Archive.
