Prooma W, Duangwilai D. The Development of a guideline management of learning the philosophy of sufficiency economy in schools the Office in the Secondary Education Service Area 21. JILS [internet]. 2019 Sep. 18 [cited 2026 Sep. 11];13(2):75-86. available from: https://so02.tci-thaijo.org/index.php/EDGKKUJ/article/view/216848