Tantachamroon, T., and L. Sunyapridakul. “Non-Therapeutic Usage of Paracetamol by Opium Addicts in Hilltribe Village”. Journal of Basic and Applied Pharmacology, vol. 6, no. 4, July 2015, p. 250, https://li01.tci-thaijo.org/index.php/JBAP/article/view/36572.