คำบาล จิตรา. “A Development of Learning Package in Topic of Linear Equation With One Variable Using Inquiry Method (5Es+D) for Mathematics Problem Solving Ability for Grade 7th Students”. Journal of Graduate School, Pitchayatat, Ubon Ratchathani Rajabhat University 14, no. 3 (December 27, 2019): 13–22. Accessed May 17, 2024. https://so02.tci-thaijo.org/index.php/Pitchayatat/article/view/237028.