Illingworth, R. S. (1987). The normal child: Some problems of the early years and their treatment (9th ed.). Churchill Livingstone.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रIllingworth, Ronald S. The Normal Child: Some Problems of the Early Years and Their Treatment. 9th ed. Edinburgh: Churchill Livingstone, 1987.
एमएलए (9वां संस्करण) प्रशस्ति पत्रIllingworth, Ronald S. The Normal Child: Some Problems of the Early Years and Their Treatment. 9th ed. Churchill Livingstone, 1987.
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