Nabila DN, Sudihartinih E, Sumiaty E. Study of Learning Obstacles on the Topic of Perimeter of a Quadrilateral Viewed from Mathematical Literacy PISA 2021. Universitas Jambi [Internet]. 2022Apr.30 [cited 2024Jul.6];12(01):11-2. Available from: https://online-journal.unja.ac.id/edumatica/article/view/15631