Widiyaningsih, Endang, Zaenuri Zaenuri, and Dwijanto Dwijanto. “Problem-Solving Ability and Self-Efficacy Based On Geometry Thinking Level In Van Hiele Learning”. Unnes Journal of Mathematics Education Research 9, no. 2 (December 23, 2020): 163-169. Accessed December 22, 2024. https://journal.unnes.ac.id/sju/ujmer/article/view/33118.