Radomsuk, Saijai, Boonmee Punthai, Saksit Khattiyasuwan, and Boonchird Pinyoanuntapong. “Factors Influencing the “Thinking” (‘khit pen’) of Undergraduates at Institutions of Higher Education in the Lower Northeastern Region: thinking khit pen”. Ph.D. in Social Sciences Journal 9, no. 1 (April 27, 2019): 76–87. accessed August 30, 2026. https://so05.tci-thaijo.org/index.php/phdssj/article/view/108531.