Fanglap S, Intanam N. An Action Reserch on Development of learning Achievement in Valleyball Course by using STAD Cooperative Learning Method for Prathom Suksa 6 Students in Bannonglai (Putpermwattanarat) School under Ubon Ratchathani Primary Educational Service Area Office 1. ubonreseva [internet]. 2021 Aug. 29 [cited 2026 Oct. 3];6(1):59-68. available from: https://so06.tci-thaijo.org/index.php/ubonreseva/article/view/251034