Soleha, Aifatus. “Improving Activity and Learning Outcomes by Using Contextual Teaching Learning (CTL) With Van Hiele Theory”. Jurnal Axioma : Jurnal Matematika dan Pembelajaran 2, no. 2 (July 28, 2017): 197–205. Accessed April 26, 2024. https://ejurnal.uij.ac.id/index.php/AXI/article/view/302.