Kartal Tasoğlu, Aslıhan, and Mustafa Bakaç. “The Effect of Problem Based Learning Approach on Conceptual Understanding in Teaching of Magnetism Topics”. International Journal of Physics & Chemistry Education 6, no. 2 (August 25, 2014): 110–122. Accessed May 22, 2022. https://www.ijpce.org/index.php/IJPCE/article/view/60.