Marceillina, Dian Novita, Iskandar Wiryokusumo, and Djoko Adi Walujo. 2019. “The Use of Probing Prompting Learning (PPL) and Inside Outside Circle (IOC) Model to Learning Outcome of Plane Figure Material”. International Journal of Educational Technology and Learning 5 (1):9-14. https://doi.org/10.20448/2003.51.9.14.