Não informado. (1969). Perspectives. Association for General and Liberal Studies.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Perspectives. Kalamazoo, Mich: Association for General and Liberal Studies, 1969.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Perspectives. Association for General and Liberal Studies, 1969.
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