Shatpattananunt, B., S. Wiangosot, and K. Pintatham. “Elderly Patients’ Experience in Using Emergency Medical Service at a Tertiary Hospital, Upper Northern Thailand”. Journal of Research in Nursing-Midwifery and Health Sciences, vol. 38, no. 3, Sept. 2018, pp. 102-15, https://he02.tci-thaijo.org/index.php/nur-psu/article/view/148324.