Não informado. (1967). Perspectives on Education. Columbia University, Teachers College.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Perspectives on Education. New York: Columbia University, Teachers College, 1967.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Perspectives on Education. Columbia University, Teachers College, 1967.
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