Jannah, U., A. Hafsi, and S. Nurhidayati. “Conceptual Understanding of Students With Special Needs in Two-Dimensional Shapes Based on Pirie Kieren’s Theory”. Jurnal Tadris Matematika, Vol. 6, no. 2, Nov. 2023, pp. 219-30, doi:10.21274/jtm.2023.6.2.219-230.