Al-Mahab, A. A. S., & Saeed, R. M. (2023). The Level of Conceptual Understanding of Functions and their Transformations and its Relationship with the Productive Motivation among Mathematics Students in the Faculty of Education University of Sana`a. Journal of Educational and Psychological Sciences, 7(17), 156-172. https://doi.org/10.26389/AJSRP.M130223