Sunarhadi RMA, Utaya S, Astina IK, Budijanto B, Rohsulina P. The effectiveness of learning materials implementation for spatial thinking ability in geographic information systems (GIS) course. lingcure [Internet]. 2022Jan.11 [cited 2026Aug.24];6(S3):131-9. Available from: http://lingcure.org/index.php/journal/article/view/2101