Não informado. University of Iowa studies in character. Institute of Character Research.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. University of Iowa Studies in Character. Iowa City, Iowa: Institute of Character Research.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. University of Iowa Studies in Character. Institute of Character Research.
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