Simanjuntak, Ruth M., Agusmanto J. B. Hutauruk, Christine Meily D Butar Butar, and Sanggam P. Gultom. 2023. “Peningkatan Kemampuan Pemahaman Konsep Matematis Siswa Menggunakan CORE (Connecting Organizing Reflecting Extending)”. Jurnal Basicedu 7 (5):3102-10. https://doi.org/10.31004/basicedu.v7i5.5987.