الفاتح الفضل محمد الحاج. “The Impact of Quality Costs on Increasing the Competitive Advantage of Sudanese Industrial Facilities (Field Study: Sennar Sugar Factory)”. University of Sinnar Journal for Human Sciences, vol. 2, no. 1, Sept. 2021, http://ojs.uofs.edu.sd/index.php/SiOJSHS/article/view/19.