Himmi, Nailul, and Asmaul Husna. 2018. “The Effectiveness on the Use of Constructivism-Based Vector Analysis Module for 4th Semester Students in Department of Mathematics Education UNRIKA in Academic Year Of 2016 2017”. Mathematics Research and Education Journal 2 (1):21-28. https://journal.uir.ac.id/index.php/JPM/article/view/2265.