Ozkan, Gulbin, and Unsal Topsakal. “Determining Students’ Conceptual Understandings of Physics Concepts”. Shanlax International Journal of Education 8, no. 3 (June 1, 2020): 1-5. Accessed October 23, 2020. http://www.shanlaxjournals.in/journals/index.php/education/article/view/2908.