Coronado, Wenceslao A., Charita A. Luna, and Dennis A. Tarepe. 2017. “Improving Students Van Hiele and Proof-Writing Ability Using Geometer’s Sketchpad”. Journal of Social Sciences (COES&Amp;RJ-JSS) 6 (2S):55-74. https://doi.org/10.25255/jss.2017.6.2S.55.74.