Sunarhadi, R. Muhammad Amin, Sugeng Utaya, I Komang Astina, Budijanto Budijanto, and Pranichayudha Rohsulina. 2022. “The Effectiveness of Learning Materials Implementation for Spatial Thinking Ability in Geographic Information Systems (GIS) Course”. Linguistics and Culture Review 6 (S3):131-39. https://doi.org/10.21744/lingcure.v6nS3.2101.