4Donner R.S,Bickley H.Problem-based learning in American medical education: an overview [J].Bull Med Libr Assoc, 1993,81 (3) :294-298.
5Chilkoti G, Wadhwa R, Kumar A. Status of problem based learning in postgraduate anesthesia teaching: A cross-sectional survey [J]. Saudi J Anaesth,2015,9( 1 ) :64-70.
6Tayyeb R.Effectiveness of problem based learning as an instructional tool for acquisition of content knowledge and promotion of critical thinking among medical students[J].J Coil Physicians Surg Pak, 2013 ( 1 ) :42-46.