Munta, Sittipong, and Pongphop Phoojomjit. 2023. “The Development Guidelines for Teacher in Learning Management for 21st Century for Schools Under The Maha Sarakham Primary Education Service Area Office 1: The Development Guidelines for Teacher in Learning Management for 21st Century for Schools Under The Maha Sarakham Primary Education Service Area Office 1”. RATANABUTH JOURNAL 5 (3). Yasothon, Thailand:194-209. https://so07.tci-thaijo.org/index.php/rtnb/article/view/3622.