Karsim, Karsim, Hardi Suyitno, and Isnarto Isnarto. “Influence of IQ and Mathematical Disposition Toward the Problem Solving Ability of Learners Grade VII through PBL Learning Model With the Assistance LKPD”. Unnes Journal of Mathematics Education 6, no. 3 (November 30, 2017): 352-359. Accessed June 27, 2022. https://journal.unnes.ac.id/sju/index.php/ujme/article/view/16936.