Amreta, Midya Yuli, Dewi Niswatul Fithriyah, and Jamilatul Mutmainah. “Calbox Jurang: A Concrete Learning Tool to Enhance Numeracy in Grade 1 Mathematics”. Prisma Sains : Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram 13, no. 3 (July 11, 2025). Accessed August 16, 2025. https://e-journal3.undikma.ac.id/index.php/prismasains/article/view/15974.