Nur Nabilah Mohd Yusof, Nurhayati Mohd Nur, Eida Nadirah Roslin, Haslinawati Besar Sa’aid , Mulia Minhat. “A Conceptual Framework to Determine the Effects of Work-Related Musculoskeletal Disorders (WMSDs) on Work Productivity of Aviation Maintenance Workers”. International Journal of Advanced Science and Technology, Vol. 29, no. 6s, Apr. 2020, pp. 1753 -62, http://sersc.org/journals/index.php/IJAST/article/view/9331.