et al., B. R. S. (2020) “The Relationship between the Ability to Make a Concept Map with the Study Achievement of PGSD Umn Al-Washliyah Medan Students”, International Journal of Advanced Science and Technology, 29(2), pp. 3405 - 3414. Available at: https://sersc.org/journals/index.php/IJAST/article/view/4886 (Accessed: 20September2021).