ไชยพรม ป., นันทะศรี ว., and เพ็งสวัสดิ์ ว. “Development of Training Curriculum to Enhance Problem-Solving Skills of Bannontae School Students under Sakon Nakhon Primary Educational Service Area Office 3”. Journal of Roi Et Rajabhat University, vol. 13, no. 1, Apr. 2019, pp. 69-78, https://so03.tci-thaijo.org/index.php/reru/article/view/185965.