5Ash K. Educators evaluate' flipped classrooms' benefits and drawbacks seen in replacing lectures with on-demand video [J]. Education Week ,2012(10) :6-8.
6Bull G,Ferster B,Kjellstrom W. Inventing the flipped class- room[J]. Learning and Leading with Technology,2012,40(1): 10-12.
7Oghea E.Self-directed learning in nurse education:review of the literature [ J ]. Adv Nurs, 2003,43 ( 1 ) : 62-70.