Kusumawati, A., Ishartiwi, and R. R. Handoyo. “Contextual Concrete Media for Improving Subtraction Skills in Elementary Students: Media Konkret Kontekstual Untuk Pemahaman Operasi Pengurangan Siswa Sekolah Dasar”. Indonesian Journal of Innovation Studies, vol. 26, no. 4, Sept. 2025, p. 10.21070/ijins.v26i4.1730, doi:10.21070/ijins.v26i4.1730.