Dallas, C. J, Kaewmart N, Detchaiyot P, Phaowiriya H. “The Effectiveness of Motivational Enhancement Group Therapy Program on Optimism Among Youths With Amphetamine Abuse”. Journal of The Department of Medical Services 43, no. 5 (October 1, 2018): 148–153. Accessed March 29, 2024. https://he02.tci-thaijo.org/index.php/JDMS/article/view/247864.