Boud, D., & Feletti, G. (1997). The Challenge of problem based learning (2nd ed.). Kogan Page.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBoud, David, और Grahame Feletti. The Challenge of Problem Based Learning. 2nd ed. London: Kogan Page, 1997.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBoud, David, और Grahame Feletti. The Challenge of Problem Based Learning. 2nd ed. Kogan Page, 1997.
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