Gaya APA
Swanson, C, P., David, I, B. (NULL).
The challenge of problem based learning .
London::
London: Kogan Page; 1991.
Gaya MLA
Swanson, Carl, P.., David, I., Boud,.
"The challenge of problem based learning".
London::
London: Kogan Page; 1991,
NULL.
Text.