Chandra, F. E. “The Effect of Problem Possing Assisted Mind Mapping on Communication and Connection Skill in Terms of Cognitive Style”. Jurnal Axioma : Jurnal Matematika Dan Pembelajaran, vol. 2, no. 1, Jan. 2017, pp. 37-55, https://ejurnal.uij.ac.id/index.php/AXI/article/view/285.