Abdussakir, A., A. Firmansyah, D. Rosikhoh, and N. L. Achadiyah. “The Geoboard Teaching Aid on Similarity and Symmetry Topics for Elementary School Students”. Edumatika : Jurnal Riset Pendidikan Matematika, vol. 5, no. 1, June 2022, pp. 14-23, doi:10.32939/ejrpm.v5i1.1088.