http://reply.papertrans.cn/2/162/16103/16103-31.png
Submitted on: 25 June 2007.
Revised on: 13 October 2007.
Accepted on: 10 November 2007.
___________________Journal of Computers in Education
http://reply.papertrans.cn/2/162/16103/16103-33.png
http://reply.papertrans.cn/2/162/16103/16103-34.png
http://reply.papertrans.cn/2/162/16103/16103-35.png
Submitted on: 30 March 2019.
Revised on: 02 June 2019.
Accepted on: 13 July 2019.
___________________Journal of Computers in Education