Ikedolapo, O. O., & Adetunji, A. F. (2009). Comparative Effect of the Guided Discovery(GD) and Concept mapping Teaching Strategies on Senior Secondary School Students (SSSS) Chemistry Achievement in Nigeria. International Journal of Physics and Chemistry Education, 1(2), 86–92. Retrieved from https://www.ijpce.org/index.php/IJPCE/article/view/9