د. نضال حماد على حماد (2021) “The Impact of Work accidents on Productive efficiency in Sudan some factories: (A case study of operate in the White Nile State)”, White Nile Journal for Studies and Research, (18), pp. 9–27. Available at: https://journals.wnu.edu.sd/index.php/wnjsr/article/view/106 (Accessed: 13 June 2026).