S. Maryani, Nunung Nurhayati, Siti Rahmah Nurshiami, Renny, and Rina Reorita, “GeoGebra Training for Geometry Subject in High School Mathematics Teachers’ Forum (MGMP) of Purbalingga Regency”, AMMA, vol. 1, no. 05, pp. 335–341, Jun. 2022.