Não informado. (1948). Language Learning. Research Club in Language Learning.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Language Learning. Ann Arbor, Mich: Research Club in Language Learning, 1948.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Language Learning. Research Club in Language Learning, 1948.
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