Thamrin, T., Saidun Hutasuhut, R. Aditia, and F. R. Putri. “The Effectiveness of the Hybrid Learning Materials With the Application of Problem Based Learning Model (Hybryd-PBL) to Improve Learning Outcomes During the COVID-19 Pandemic”. IJORER : International Journal of Recent Educational Research, Vol. 3, no. 1, Jan. 2022, pp. 124-3, doi:10.46245/ijorer.v3i1.178.