Não informado. (1980). For the Learning of Mathematics. FLM Publishing Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. For the Learning of Mathematics. Montreal, Canada: FLM Publishing Association, 1980.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. For the Learning of Mathematics. FLM Publishing Association, 1980.
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