Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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