Viroj Thammajinda และ Nampueng Intanate. (2015) An Evaluation of the Lower Secondary School Mathematics Teacher Competency. Chiang Mai University:ม.ป.ท.Viroj Thammajinda และ Nampueng Intanate. 2015. An Evaluation of the Lower Secondary School Mathematics Teacher Competency. ม.ป.ท.:Chiang Mai University;Viroj Thammajinda และ Nampueng Intanate. An Evaluation of the Lower Secondary School Mathematics Teacher Competency. ม.ป.ท.:Chiang Mai University, 2015. Print.