9[2]Barrows,H.S.(1986)A taxonomy of problem-based learning methods[J].Med Educ,20,481-486.
10[3]Duch BJ.Models for problem-based instruction in undergraduate course.In:Duch BJ,Gorh SE,Allen DE,eds.The power of problem-based learning[B].Virginia:Stylus Publishing,2001,39-45.
