EMY ARTUTI. Pemahaman Mahasiswa Program Studi Pendidikan Matematika tentang Grup Berdasarkan Teori APOS. JURNAL PENDIDIKAN, [S. l.], v. 20, n. 2, p. 140–148, 2019. DOI: 10.52850/jpn.v20i2.888. Disponível em: https://e-journal.upr.ac.id/index.php/JPN/article/view/888. Acesso em: 14 jun. 2025.