Não informado. (1991). Behavior and Social Issues. Cambridge Center for Behavioral Studies.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Behavior and Social Issues. Cambridge, Mass: Cambridge Center for Behavioral Studies, 1991.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Behavior and Social Issues. Cambridge Center for Behavioral Studies, 1991.
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