สุวรรณนพรัตน์ นภา. 2019. “Situation of Dental Caries and Periodontal Disease of people who get services in Kongkrailas hospital, Sukhothai province”. Community and Social Development Journal 20 (1). Chiang Mai, Thailand:105-14. https://doi.org/10.14456/rcmrj.2019.163643.