Gunawardane, Damitha Asanga, Samath D Dharmaratne, and Samath D Dharmaratne. “Level of Fatigue and Daytime Sleepiness Among Heavy Vehicle Drivers in Sri Lanka”. South East Asia Journal of Public Health 4, no. 1 (February 2, 2015): 9–16. Accessed September 8, 2025. https://www.banglajol.info/index.php/SEAJPH/article/view/21832.