Copeland, R. W. (1974). How children learn mathematics: Teaching implications of piaget's research (2nd ed.). Macmillan.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCopeland, Richard W. How Children Learn Mathematics: Teaching Implications of Piaget's Research. 2nd ed. New York: Macmillan, 1974.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCopeland, Richard W. How Children Learn Mathematics: Teaching Implications of Piaget's Research. 2nd ed. Macmillan, 1974.
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