9Anthur W. Chickering, Zelda F. Gamson. Severn Priciples for Good Practice in Undergraduate Education. AAHE Bulletin,March, 1987.
10Active Learning:Getting Students to Work and Think in the classroom. Speaking of Teaching, Stanford University Newsletter on Teaching, 1993, Vo15. No.1. (From:http://ctl.stanford.edu/teach/speakmenu.html).