Reskina, S. Saragih, E. Suanto, and Maimunah. “Student Errors Analysis Problem-Solving Based Castolan Theory on Relations and Functions Material”. Numerical: Jurnal Matematika Dan Pendidikan Matematika, vol. 7, no. 1, June 2023, pp. 157-66, doi:10.25217/numerical.v7i1.2895.