Sa-nguan-ngam, P. “A Survey Coronavirus 2019 Vaccination of Cancer Patients in the Surgical Outpatient Department at Lopburi Cancer Hospital”. Journal of The Department of Medical Services, vol. 48, no. 3, Sept. 2023, pp. 46-51, https://he02.tci-thaijo.org/index.php/JDMS/article/view/260411.