Anjaswari, F., Y. Mulyawati, T. Mulyawati, and fitri S. Sundari. “Application of E-Learning Based on Constructivism Approach to Understanding of Student Concept in The Study of Social Students”. International Conference on Elementary Education, Vol. 2, no. 1, Mar. 2020, pp. 1365-7, https://proceedings.upi.edu/index.php/icee/article/view/763.