Srisuk, S., S. Thongkanluang, and A. Sangarwut. “Developing Mathematics Learning Activities Using Open Approach Together with Think-Pair-Share Technique to Promote the Ability to Solve Mathematical Problems in Grade 6 Students”. Journal of Graduate MCU KhonKaen Campus, vol. 12, no. 3, Sept. 2025, pp. 223-34, https://so02.tci-thaijo.org/index.php/jg-mcukk/article/view/277422.