3Rourke, L.,Anderson,T., et al. Assessing social presence in asyn chronous:text-based computer conferencing[J].Journal of Distance Education, 1999,14(3):51-70.
4Dondd Kirkpatrick(1996),Great Ideas Revisited:Reisiting Kirkpatrick' s Four-Lever Model, Training and Development 50, no. 1, pp54 -57.
5Jennifer Stone and Virginia Wason,Measuring Training ROI and Impact, The American Society for Training and Developmetn( ASTO), 1999.
6Judith B. Strother,An Assessment of the Effectiveness of e-learning Corporate Training Programs,International Review of Research in Open and Distance Learning no. 4,2002.
7Moulds,L. D. Using Distance Learning in the Training of A dult Learners. ED Journal. no. 4 1996.
