APA (7 वां संस्करण) प्रशस्ति पत्र
Copeland, R. W. (1979). How children learn matematics: Teaching implications of Piaget research.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Copeland, Richard W. How Children Learn Matematics: Teaching Implications of Piaget Research. 1979.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Copeland, Richard W. How Children Learn Matematics: Teaching Implications of Piaget Research. 1979.
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