Onia, S.I. and Adam, A.Y. 2021. The extent to which 21stCentury Skills are included in high School Chemistry courses in Sudan. (Faculty of Arts Journal) مجلة كلية الآداب - جامعة مصراتة. 17 (Mar. 2021), 181–156. DOI:https://doi.org/10.36602/faj/2021.n17.09.