Não informado. (1952). Adult leadership. Adult Education Association of the United States of America.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Adult Leadership. Washington: Adult Education Association of the United States of America, 1952.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Adult Leadership. Adult Education Association of the United States of America, 1952.
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