Kullanit, Apisit, and Nutta Taneepanichskul. “Transportation Barriers on Healthcare Utilization Among Elderly Population Living in Mahasarakham Province, Thailand”. Journal of Health Research 31, no. Suppl. 2 (March 6, 2018): S233–238. Accessed May 18, 2022. https://he01.tci-thaijo.org/index.php/jhealthres/article/view/114558.