Submitted on: 21 October 2017.
Revised on: 14 November 2017.
Accepted on: 07 January 2018.
___________________Journal of E-Learning and Knowledge Society
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Submitted on: 10 July 2002.
Revised on: 07 August 2002.
Accepted on: 28 September 2002.
___________________Journal of E-Learning and Knowledge Society
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http://reply.papertrans.cn/2/165/16488/16488-35.png
Submitted on: 01 May 2017.
Revised on: 22 May 2017.
Accepted on: 14 June 2017.
___________________Journal of E-Learning and Knowledge Society