Muzangwa, Jonatan, and Ugorji I. Ogbonnaya. “Undergraduate Mathematics Education Students’ Visual Representations of Multivariable Functions”. Edumatica : Jurnal Pendidikan Matematika 12, no. 3 (December 31, 2022): 212-221. Accessed November 26, 2024. https://online-journal.unja.ac.id/edumatica/article/view/15712.