Elkind, D., & Elkind, D. (1975). Studies in cognitive development: Essays in honour of Jean Piaget. Oxford University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रElkind, David, और David;Flavell Elkind. Studies in Cognitive Development: Essays in Honour of Jean Piaget. Oxford University Press, 1975.
एमएलए (9वां संस्करण) प्रशस्ति पत्रElkind, David, और David;Flavell Elkind. Studies in Cognitive Development: Essays in Honour of Jean Piaget. Oxford University Press, 1975.
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