Não informado. (1966). Research in Education. Educational Research Information Center.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Research in Education. Washington: Educational Research Information Center, 1966.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Research in Education. Educational Research Information Center, 1966.
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