Saputri, V., and Rizal Kamsurya. “THE NEWMAN PROCEDURE FOR ANALYZING STUDENTS’ ERRORS IN SOLVING SYSTEMS OF LINEAR EQUATIONS”. Kalamatika: Jurnal Pendidikan Matematika, Vol. 6, no. 1, Apr. 2021, pp. 31-44, doi:10.22236/KALAMATIKA.vol6no1.2021pp31-44.