Noviana, Widyah, Windia Hadi, and Ita Handayani. 2020. “THE EFFECTIVENESS OF GEOGEBRA-BASED VAN HIELE MODEL ON MATHEMATICAL DISPOSITION ASSESSED FROM EARLY MATHEMATICS ABILITY”. Kalamatika: Jurnal Pendidikan Matematika 5 (2), 167-80. https://doi.org/10.22236/KALAMATIKA.vol5no2.2020pp167-180.