Tough, P. (2016). Helping children succeed: What works and why. Houghton Mifflin Harcourt.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTough, Paul. Helping Children Succeed: What Works and Why. Boston: Houghton Mifflin Harcourt, 2016.
एमएलए (8वां संस्करण) प्रशस्ति पत्रTough, Paul. Helping Children Succeed: What Works and Why. Houghton Mifflin Harcourt, 2016.
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