5Hmelo-Silver, Cindy E. Problem-Based Learning: What and How Do Students Learn? [J]. Educational Psychology Review,2004(16):235-266.
6W. Porter. Mayo,Michaelb. DonneUy. Characteristics of the ideal Problem-based learning tutor in clinical medicine, Evaluation & the Health Professions, Vol 18 No 2,June 1995 page 124-136.
7Willem S De Grave, Diana H J M Dolmans, Cees P M van der Vleuten, Tutor intervention profile: reliability and validity. Medical Education 1998,32,page 262-268.