Lovell, K. (1966). The growth of basic mathematical and scientific concepts in children (5th ed.). Hodder and Stoughton.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLovell, K. The Growth of Basic Mathematical and Scientific Concepts in Children. 5th ed. London: Hodder and Stoughton, 1966.
एमएलए (9वां संस्करण) प्रशस्ति पत्रLovell, K. The Growth of Basic Mathematical and Scientific Concepts in Children. 5th ed. Hodder and Stoughton, 1966.
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