Anisa, Uirma Isnani, and Kartini Kartini. “Analysis of Student Errors in Solving Relation and Function Problems Based on Kastolan Error Theory Class VIII SMP IT Bangkinang”. Edumatica : Jurnal Pendidikan Matematika 13, no. 02 (September 3, 2023): 172-180. Accessed July 18, 2024. https://online-journal.unja.ac.id/edumatica/article/view/19473.