AlMetrek, M. A. S., M. Y. Khan, A. Othman, and M. A.- Fattah. “Effect of Shift-Work on Sleeping Quality of Male Factory Workers in Aseer Industrial Area, Khamis Mushayte, KSA”. Asian Journal of Medical Research, Vol. 5, no. 1, Dec. 2015, pp. 5-11, https://aijournals.com/index.php/ajmr/article/view/148.