คูณทา จ, พันธ์งาม อ. A Development of Mathematics Reasoning Ability Through the Heuristics Thinking Model for Prathom Suksa 3 Students of Ban Nongkhun School under Ubon Ratchathani Primary Educational Service Area Office 3. ubonreseva [internet]. 2021 Aug. 27 [cited 2026 Oct. 3];2(1):62-9. available from: https://so06.tci-thaijo.org/index.php/ubonreseva/article/view/250839