Octaria, Dina, Zulkardi Zulkardi, Ratu Ilma Indra Putri, and Cecil Hiltrimartin. 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.