6Ferretti SM, Krueger WA, Gabel LL, et al. Lake Erie College of Osteopathic Medicine's preclinical problem -based learning pathway[J]. J Am Osteopath Asso, 2007, 107 (10) : 443 - 449.
7Beachey WD. A comparison of problem - based learning and traditional curricula in baccalaureate respiratory therapy education [J]. Respir Care, 2007, 52(11) : 1497 -1506.