Przeworski, A., & Sprague, J. (1986). Paper stones: A history of electoral socialism. Chicago.
Lua i Stíl Chicago (17ú heag.)Przeworski, Adam, agus John Sprague. Paper Stones: A History of Electoral Socialism. Chicago, 1986.
Lua MLA (8ú heag.)Przeworski, Adam, agus John Sprague. Paper Stones: A History of Electoral Socialism. Chicago, 1986.
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