Chomyindee, L., and B. Muktabhant. “Caffeine Beverage Consumption in the Type 2 Diabetic Patients Attending Diabetes Clinic at Manchakhiri Hospital in Khon Kaen Province”. Srinagarind Medical Journal, vol. 28, no. 4, Dec. 2013, pp. 431-4, https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/15394.