เกษมกุลทรัพย์ เ, พัฒนพงศา น. The Development of Education Model by Sub-District Non-Formal Education for Developing the Aging Quality of Life Sub-Urban Areas in Chiang Mai Province Sub-Urban areas. Com. Soc. Dev. J. [internet]. 2018 Dec. 26 [cited 2025 Dec. 6];17(2):73-87. available from: https://so05.tci-thaijo.org/index.php/cmruresearch/article/view/213901