ศิริธรรมานุกุล ว., ธนกิจวณิชกุล ม., and แสงทองดี จ. “Reasons, Perceived Barriers and Benefits in People over 50 Years Who Not Undergo Colonoscopy”. Thai Journal of Nursing, vol. 60, no. 3, Jan. 2016, pp. 36-44, https://he02.tci-thaijo.org/index.php/TJN/article/view/197529.