Puangpayorm Chidthong. 2008. Development of learning activities to promote thinking skills of Mathayom Suksa 2 students in schools attached to Chiang Mai Educational Service Area Office 2. Field of Study Curriculum and Instruction, Chiang Mai University;

Puangpayorm Chidthong. Development of learning activities to promote thinking skills of Mathayom Suksa 2 students in schools attached to Chiang Mai Educational Service Area Office 2. . Chiang Mai:Chiang Mai University, 2008.

Puangpayorm Chidthong. (2008) Development of learning activities to promote thinking skills of Mathayom Suksa 2 students in schools attached to Chiang Mai Educational Service Area Office 2 . Chiang Mai University/Chiang Mai.