Chareonwat, Apiwan. “Prevalence and Factors Associated with Insomnia in Elderly over 60 Years of Age at Family Medicine Outpatient Department Rajavithi Hospital”. Journal of The Department of Medical Services 49, no. 1 (March 15, 2024): 80–88. accessed September 25, 2026. https://he02.tci-thaijo.org/index.php/JDMS/article/view/263801.