Boonshan Sangfai, and Payong Wanikiat. “Factors Affecting the Sleep Quality of the Elderly in Thailand”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 63, no. 1 (July 19, 2022): 118–131. Accessed May 19, 2024. https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/14298.