ทุมเมฆ อ, ภิรมจิตรผ่อง เ. Development of the STAD-based Cooperative Learning Management Model to Improve the Tone Changing Skill in Thai for Pratomsuksa Two (Grade two) Students of Ban Nongsaeng School under the Jurisdiction of Ubon Ratchathani Primary Educational Service Area Office 5. ubonreseva [internet]. 2021 Aug. 27 [cited 2026 Oct. 3];1(1):85-93. available from: https://so06.tci-thaijo.org/index.php/ubonreseva/article/view/250808