จันทรวรรณ แก้วไสว. 2023. “The Study of Maximum Phonation Time of Elderly in Nonthaburi Province: The Study of Maximum Phonation Time of Elderly in Nonthaburi Province”. Thai Journal of Otolaryngology Head and Neck Surgery 23 (2). https://he02.tci-thaijo.org/index.php/rcotJ/article/view/258275.