Obafemi, Deborah T. A., and Fidelis A. Onwioduokit. “Identification of Difficult Concepts in Senior Secondary School Two (SS2) Physics Curriculum in Rivers State, Nigeria”. Asian Journal of Education and e-Learning 1, no. 5 (December 21, 2013). Accessed April 19, 2024. https://ajouronline.com/index.php/AJEEL/article/view/483.