Sonthiraksa, Tanin. “Difficulty Falling-Asleep and Sleep Quality in a Website-Based Survey”. Journal of The Department of Medical Services 47, no. 2 (June 29, 2022): 109–115. Accessed April 24, 2024. https://he02.tci-thaijo.org/index.php/JDMS/article/view/257295.