Rattanaphongset, Phanida, Tatree Bosittipichet, and Pakkawee Nakawiro. “Factors Associated with Insomnia Symptoms among Elderly in Primary Care Unit”. Journal of Preventive Medicine Association of Thailand 11, no. 1 (May 17, 2021): 188–201. accessed August 29, 2026. https://he01.tci-thaijo.org/index.php/JPMAT/article/view/247246.