Não informado. (1971). Educational documentation and information. International Bureau of Education.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Educational Documentation and Information. Geneve, Suíça: International Bureau of Education, 1971.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Educational Documentation and Information. International Bureau of Education, 1971.
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