ลุลอบ ก, เอกะกุล ธ. A Operation on Development of Achievement in Science Using Backward Design Approach for Grade Three Students at Baan Buenghom School under the Jurisdiction of Ubon Ratchathani’s Primary Educational Service Area Office 2. ubonreseva [internet]. 2021 Aug. 27 [cited 2026 Oct. 3];2(1):17-26. available from: https://so06.tci-thaijo.org/index.php/ubonreseva/article/view/250832