5Newman MJ. Problem based learning: an introduction and overview of the key features of the approach[J]. J Vet Med Educ, 2005, 32(1): 12-20.
6Ogunniyi A. Problem-Based learning comes highly recommended[J]. Aft J Med Med Sci, 2015, 44(4): 286.
7Norman GR, Schmidt HG. Effectiveness of problem-based learning curricula: theory, practice and paper darts[J]. Med Educ, 2000, 34(9): 721-728.
8Malan SB, Ndlovu M, Engelbrecht P. Introducing problem-based learning(PBL)into a foundation programme to develop self-directed learning skills[J]. South Aft J Educ, 2014, 34(1): 1-16.