Baokam P, Sriphan A. LEARNING ACTIVITIES FOR THE DEVELOPMENT OF MENTAL WELL-BEING OF THE ELDERLY USING THREEFOLD TRAINING PRINCIPLE (DTRAISIKKHA) AT SENIOR ASSOCIATION IN THA CHANGE SUB-DISTRICT, PHROMPIRAM DISTRICT, PHITSANULOK PROVINCE. JBER [internet]. 2022 Apr. 30 [cited 2026 Aug. 28];8(1):135-49. available from: https://so06.tci-thaijo.org/index.php/jber/article/view/256919