Ristanti, Felisia Ferra, and Fajar Arianto. “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, vol. 4, no. 2, Aug. 2019, pp. 90-104, doi:10.19184/geosi.v4i2.9968.