Nurhayati Mohd Nur, Ahmad Furqan Mohd Yusuf, Nur Nabilah Mohd Yusof. 2020. “Physical Fatigue and Work-Related Musculoskeletal Disorders Among Air Traffic Controllers (ATCOs)”. International Journal of Advanced Science and Technology 29 (06), 156 -61. http://sersc.org/journals/index.php/IJAST/article/view/11308.