Não informado. (1990). New Directions for Adult and Continuing Education. Jessey Bass Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. New Directions for Adult and Continuing Education. San Francisco, Calif: Jessey Bass Publishers, 1990.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. New Directions for Adult and Continuing Education. Jessey Bass Publishers, 1990.
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