NABILA, Deka Nisa; SUDIHARTINIH, Eyus; SUMIATY, Encum. 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. 1, p. 11–21, 2022. DOI: 10.22437/edumatica.v12i01.15631. Disponível em: https://online-journal.unja.ac.id/edumatica/article/view/15631. Acesso em: 17 mar. 2025.