Anurattananon, C., P. Klomjit, P. Pothongsuk, and P. Nardwaranon. “Activity-Based Costing of Public Hospital Categorizing in Disease Groups Case Study : Bangkhuntian Geriatric Hospital”. Thai Industrial Engineering Network Journal, vol. 3, no. 1, Jan. 2017, pp. 65-73, https://ph02.tci-thaijo.org/index.php/ienj/article/view/178793.