“Using the Classroom Practice Diagnostic Framework (CPDF) to Investigate Teaching Difficulties of a Physics Topic”, Mediterr. J. Soc. Sci., vol. 4, no. 3, p. 637, Sep. 2013, Accessed: May 03, 2024. [Online]. Available: https://www.richtmann.org/journal/index.php/mjss/article/view/520