Gaya APA

Swanson, C, P., I, I, B, D, I, F, G. (NULL). The challenge of problem-based learning . London:: London: Kogan Page; 1997.

Gaya MLA

Swanson, Carl, P.., I, I., Boud,, David, II., Feletti,, Grahame. "The challenge of problem-based learning". London:: London: Kogan Page; 1997, NULL. Text.