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Submitted on: 11 October 2018.
Revised on: 08 November 2018.
Accepted on: 03 December 2018.
___________________ASR Chiang Mai University Journal of Social Sciences and Humanities
Submitted on: 03 January 2014.
Revised on: 20 April 2014.
Accepted on: 15 May 2014.
___________________ASR Chiang Mai University Journal of Social Sciences and Humanities
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