Lichtheim, G. (1969). The origins of Socialism. London: Weidenfeld and Nicolson.
Lua i Stíl Chicago (17ú heag.)Lichtheim, George. The Origins of Socialism. London: Weidenfeld and Nicolson, 1969.
Lua MLA (8ú heag.)Lichtheim, George. The Origins of Socialism. London: Weidenfeld and Nicolson, 1969.
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