Aziz, Tian Abdul, and Meyta Dwi Kurniasih. “External Representation Flexibility of Domain and Range of Function”. Journal on Mathematics Education 10, no. 1 (January 1, 2019): 143–156. Accessed July 8, 2025. https://jme.ejournal.unsri.ac.id/index.php/jme/article/view/3783.