APA (7 वां संस्करण) प्रशस्ति पत्र

Boud, D., & Feletti, G. (1997). The Challenge of problem based learning (2nd ed.). Kogan Page.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Boud, David, और Grahame Feletti. The Challenge of Problem Based Learning. 2nd ed. London: Kogan Page, 1997.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Boud, David, और Grahame Feletti. The Challenge of Problem Based Learning. 2nd ed. Kogan Page, 1997.