Sabil, H., Asrial, A., Syahrial, S., Robiansah, M. A., Zulkhi, M. D., Damayanti, L., Kiska, N., Silvia, N. dan Ubaidillah, U. (2021) “Online Geoboard Media Improves Understanding of Two-dimensional Flat Shape Concepts in Elementary School Students”, International Journal of Elementary Education, 5(4), hlm. 685–691. doi: 10.23887/ijee.v5i4.41785.