ปัทมสัตยาสนธิ อ. “Associated factor of edentulousness of Thai elderly in department of dentistry Sukhothai hospital Sukhothai province”. Thai Dental Public Health Journal, vol. 13, no. 2, Apr. 2008, pp. 97-105, https://he02.tci-thaijo.org/index.php/ThDPHJo/article/view/209850.