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Submitted on: 07 March 2013.
Revised on: 18 April 2013.
Accepted on: 16 June 2013.
___________________Journal of Computers in Education
Submitted on: 01 August 2015.
Revised on: 10 November 2015.
Accepted on: 15 December 2015.
___________________Journal of Computers in Education
Submitted on: 01 December 1998.
Revised on: 10 February 1999.
Accepted on: 27 February 1999.
___________________Journal of Computers in Education
Submitted on: 02 April 2007.
Revised on: 12 July 2007.
Accepted on: 25 August 2007.
___________________Journal of Computers in Education
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