Butsathon, N., V. Luvira, P. Nonjui, P. Deenok, and W. Aunruean. “Sleep Pattern among Students in Khon Kaen University”. Srinagarind Medical Journal, vol. 35, no. 3, June 2020, pp. 332-9, https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/243979.