Dave-Ugwu , Priscilla O., Anthonia E. Onah, and Eunice O Chukwunwogor. “Open Textbook Adoption: Implication for Chemistry Education in Nigerian Secondary Schools”. West African Journal of Open and Flexible Learning 9, no. 1 (July 6, 2020): 25–40. Accessed April 25, 2024. https://wajofel.org/index.php/wajofel/article/view/61.