NABILA, D. N.; SUDIHARTINIH, E.; SUMIATY, E. Study of Learning Obstacles on the Topic of Perimeter of a Quadrilateral Viewed from Mathematical Literacy PISA 2021. Edumatica : Jurnal Pendidikan Matematika, [S. l.], v. 12, n. 01, p. 11-21, 2022. DOI: 10.22437/edumatica.v12i01.15631. Disponível em: https://online-journal.unja.ac.id/edumatica/article/view/15631. Acesso em: 6 jul. 2024.