PutriH. E., MuqodasI., Wahyudy M. A., and NuraeniF. “The Effect of Concrete-Pictorial-Abstract (CPA) Approach on The Decrease of Mathematical Anxiety in Primary School”. International Conference on Elementary Education, Vol. 2, no. 1, Mar. 2020, pp. 80-93, http://proceedings.upi.edu/index.php/icee/article/view/609.