Ristanti, F. F., & Arianto, F. (2019). FLASH CARD MEDIA UTILIZATION TO IMPROVE STUDENT ACTIVITY AND LEARNING OUTCOMES OF FAUNA DISTRIBUTION SUBTOPIC IN CLASS XI IPS I SMA XIN ZHONG SURABAYA. Geosfera Indonesia, 4(2), 90–104. https://doi.org/10.19184/geosi.v4i2.9968