เดชพิทักษ์ อ., and นุชพ่วง ร. “The chewing ability of elderly people in Chiang Mai”. Thai Dental Public Health Journal, vol. 13, no. 1, Feb. 2008, pp. 97-105, https://he02.tci-thaijo.org/index.php/ThDPHJo/article/view/210666.