Patarakorn, Anggoon, Tanya Singhtho, and Sumnao Nilaban. 2017. “A Study of Activity Base Costing Analysis in Thanyarak Institute and the Cost Related to Drug Addict Absenteeism”. Journal of Health Science of Thailand 24 (2):305-16. https://thaidj.org/index.php/JHS/article/view/446.