Não informado. (2000). University of Iowa studies in social science. University of Iowa.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. University of Iowa Studies in Social Science. Iowa City, Iowa: University of Iowa, 2000.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. University of Iowa Studies in Social Science. University of Iowa, 2000.
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