Não informado. (1963). Education abstracts. American College Public Relations Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Education Abstracts. Washington: American College Public Relations Association, 1963.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Education Abstracts. American College Public Relations Association, 1963.
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