Tarisara Radrongtai และ Montri Thongmoon. (2026) The Effects of 4Ex2 Instructional Model Integrated with Higher-Order Questions on the Mathematical Problem-Solving Ability of Grade 11 Students. <i>Journal of Science and Science Education</i>, <i>9</i>(1), 49-61.Tarisara Radrongtai และ Montri Thongmoon. "The Effects of 4Ex2 Instructional Model Integrated with Higher-Order Questions on the Mathematical Problem-Solving Ability of Grade 11 Students". Journal of Science and Science Education 9 (2026):49-61.Tarisara Radrongtai และ Montri Thongmoon. The Effects of 4Ex2 Instructional Model Integrated with Higher-Order Questions on the Mathematical Problem-Solving Ability of Grade 11 Students. Faculty of Science, Ubon Ratchathani University:ม.ป.ท. 2026.