Kaewphichai, Phichitra, et al. “Cost-Effectiveness Analysis of Health and Nutrition Promotion for the Elderly in Khlong Prab Subdistrict, Ban Na San District, Surat Thani Province”. Journal of Applied Economics and Management Strategy, vol. 12, no. 2, Dec. 2025, pp. 21-40, doi:10.56825/jaems.2025.1226316.