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Sarayut Thonguthai and Sittichai Kaewkuekool
The Social Sciences 6 ( 3 ): 241 - 249 , 2011
Phongyut Juntong, Sittichai Kaewkuekool and Suchapa Netpadit
The Social Sciences 6 ( 5 ): 328 - 331 , 2011