Sutini, Sutini, Iffana Fitrotul Aaidati, and Kusaeri Kusaeri. “Identifying the Structure of students’ Argumentation in Covariational Reasoning of Constructing Graphs”. Beta: Jurnal Tadris Matematika 13, no. 1 (May 30, 2020): 61–80. Accessed May 13, 2021. https://jurnalbeta.ac.id/index.php/betaJTM/article/view/374.