Sunarhadi, R.M.A., Utaya, S., Astina, I.K., Budijanto, B. and Rohsulina, P. 2022. The effectiveness of learning materials implementation for spatial thinking ability in geographic information systems (GIS) course. Linguistics and Culture Review. 6, S3 (Jan. 2022), 131-139. DOI:https://doi.org/10.21744/lingcure.v6nS3.2101.