Munta, S. and Phoojomjit, P. 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 (Dec. 2023), 194–209.