Fadillah, Lukky, Kartono Kartono, and Supriyadi Supriyadi. 2020. “Mathematical Communication Ability Based On Cognitive Style in PBL With Tutor Feedback Assisted by Triangle Calculator”. Unnes Journal of Mathematics Education Research 9 (1), 86-92. https://journal.unnes.ac.id/sju/ujmer/article/view/32196.