Alshikh Alhameem Yousif SHIAT. Investigating Difficulties Encountered by Sudanese Secondary Schools in Implementing National Curriculum Policy . oiujhs [انترنت]. 31 مايو، 2026 [وثق 13 يونيو، 2026];22(2):399-15. موجود في: https://journal.oiu.edu.sd/index.php/oiujhs/article/view/3639