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Papila, D. E., Olds,Sally Wendkos, Feldman, R. D., & Gross, D. (2004). Human development (9th ed.). New Delhi: Tata McGraw-Hill Publishing Company Limited.

Papila, Diane E., Olds,Sally Wendkos, Ruth Duskin Feldman, and Dana Gross. Human Development. 9th ed. New Delhi: Tata McGraw-Hill Publishing Company Limited, 2004.

Papila, Diane E., Olds,Sally Wendkos, Ruth Duskin Feldman, and Dana Gross. Human Development. 9th ed. New Delhi: Tata McGraw-Hill Publishing Company Limited, 2004.