JUNITAWATI, J.; ABIDIN, A. A. The efforts to improve mathematics learning in material three-dimensional shapes by use of concrete learning objects. Panicgogy International Journal, [S. l.], v. 2, n. 1, p. 22–32, 2024. DOI: 10.59965/pij.v2i1.80. Disponível em: https://nakiscience.com/index.php/pij/article/view/80. Acesso em: 29 oct. 2025.