Não informado. (2000). University of Iowa studies in sociology, economics, politics and history. University of Iowa.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. University of Iowa Studies in Sociology, Economics, Politics and History. Iowa City, Iowa: University of Iowa, 2000.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. University of Iowa Studies in Sociology, Economics, Politics and History. University of Iowa, 2000.
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