Pramestika, Ni Putu Dyah, I Gusti Agung Ayu Wulandari, and I Wayan Sujana. 2020. “Enhancement of Mathematics Critical Thinking Skills through Problem Based Learning Assisted With Concrete Media”. Journal of Education Technology 4 (3):254-63. https://doi.org/10.23887/jet.v4i3.25552.