Tough, P. (2019). The years that matter most: How college makes or breaks us. Houghton Mifflin Harcourt.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTough, Paul. The Years That Matter Most: How College Makes or Breaks Us. Boston: Houghton Mifflin Harcourt, 2019.
एमएलए (8वां संस्करण) प्रशस्ति पत्रTough, Paul. The Years That Matter Most: How College Makes or Breaks Us. Houghton Mifflin Harcourt, 2019.
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