เหล่าบุตรสา ม, เอกะกุล ธ. Development of the Mathematic Skills through the Cooperative Learning Activities by Using STAD Technique of Grade Mathayam Suksa1 of Ban Nong Tao School under Ubon Ratchathani Primary Educational Service Area Office 4. ubonreseva [internet]. 2021 Aug. 27 [cited 2026 Oct. 3];1(1):66-73. available from: https://so06.tci-thaijo.org/index.php/ubonreseva/article/view/250784