5Mc Parland M, Noble LM, Livingston G. The effectiveness of prolem-based learning compared to traditional teaching in under graduate psychiatry[J]. Med Educ, 2004,38 (8) : 859-867.
6DOEHY F, SEGERS M, VAN denBossche P,et al. Effects of problem-based learning: a meta-analysis[J]. Learning and Instruction, 2003(13):533-568.