Octaria, D., Zulkardi, Z., Putri, R. I. I., & Hiltrimartin, C. (2026). Spatial Literacy and Error Patterns in Elementary 3D Geometry: Foundations for Local Instructional Theory. Edumatica : Jurnal Pendidikan Matematika, 16(1), 19–39. https://doi.org/10.22437/edumatica.v16i1.48212