Yusfita Yusuf, Hardi Suyitno, Y. L. Sukestiyarno and Isnarto. “The Statistical Reasoning Obstacles of Mathematics Pre-Service Teacher on Descriptive Statistics”. International Journal of Advanced Science and Technology 29, no. 08 (May 28, 2020): 888 - 898. Accessed September 20, 2021. https://sersc.org/journals/index.php/IJAST/article/view/19240.