Ganesan Mayalagu, Mokhtar Jaafar, Lam Kuok Choy and Mohd Izwan Mahmud. 2020. “ The Effectiveness of Geographic Information System (GIS) on Spatial Thinking Skills (STS) Among Geography Students”. International Journal of Advanced Science and Technology 29 (9s), 1000 - 1009. http://sersc.org/journals/index.php/IJAST/article/view/13368.