FERRYANSYAH; IZZATIN, M. . ANALYSIS OF STUDENTS’ UNDERSTANDING OF ALGEBRA CONCEPTS BASED ON APOS THEORY: A STUDY IN LINEAR ALGEBRA COURSES. Jurnal Penalaran dan Riset Matematika, [S. l.], v. 5, n. 1, p. 20–31, 2026. DOI: 10.62388/prisma.v5i1.619. Disponível em: https://journal.almeeraeducation.id/prisma/article/view/619. Acesso em: 26 jul. 2026.