Não informado. (1980). New Directions for Teaching and Learning. Jessey Bass Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. New Directions for Teaching and Learning. San Francisco, Calif: Jessey Bass Publishers, 1980.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. New Directions for Teaching and Learning. Jessey Bass Publishers, 1980.
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