Apiratwarakul, Korakot, Dhanu Gaysonsiri, and Wisut Sukeepaisarncharoen. “A Comparative Study of the Start Time Between Using Radio and Bell Signals in Emergency Medical Services (EMS) Activation”. Srinagarind Medical Journal 29, no. 1 (March 26, 2014): 2–6. Accessed December 3, 2022. https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/17278.