Berhe, Goitom Gebreyohannes, Gebrekidan Mebrahtu Tesfemariam, and Gebrehiwot Hagos Weldemichae. 2024. “Challenges for Effective Teaching of Chemistry in Secondary Schools of Developing Countries: A Review”. African Journal of Chemical Education 14 (2):61-100. https://www.ajol.info/index.php/ajce/article/view/272356.