Putri, D., Z. R. Habibie, and Aldino. “Students’ Conceptual Challenges in Learning Multiplication: Tantangan Konseptual Siswa Dalam Pembelajaran Perkalian”. Indonesian Journal of Innovation Studies, vol. 26, no. 4, Sept. 2025, p. 10.21070/ijins.v26i4.1683, doi:10.21070/ijins.v26i4.1683.