Uadrang, S., W. . Chalermchawalit, S. . Siriarechakul, Y. Saranyusej, P. Pinsunthon, and I. Kumfong. “Unit Cost and Break–Even Point of the Intensity Modulated Radiotherapy and the Volumetric Modulated Arc Therapy for Head and Neck Cancer Treatment in Lopburi Cancer Hospital”. Journal of The Department of Medical Services, vol. 45, no. 4, Mar. 2021, pp. 75-80, https://he02.tci-thaijo.org/index.php/JDMS/article/view/249770.