Alshikh Alhameem Yousif, Sana Hussien Ibrahim Alameen, Tahiya. "Investigating Difficulties Encountered by Sudanese Secondary Schools in Implementing National Curriculum Policy ". Omdurman Islamic University Journal for Human Sciences 22, no. 2 (مايو 31, 2026): 399-415. تاريخ الوصول يونيو 13, 2026. https://journal.oiu.edu.sd/index.php/oiujhs/article/view/3639.