Yusfita Yusuf, Hardi Suyitno, Y. L. Sukestiyarno and Isnarto. 2020. “The Statistical Reasoning Obstacles of Mathematics Pre-Service Teacher on Descriptive Statistics”. International Journal of Advanced Science and Technology 29 (08), 888 -98. http://sersc.org/journals/index.php/IJAST/article/view/19240.