Wiangnon, Surapon, Krittika Suwanrungruang, and Supot Kamsa-ard. “Cholangiocarcinoma in Khon Kaen Province”. Srinagarind Medical Journal 27 (August 23, 2013): 326–330. accessed September 16, 2026. https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/11157.