Wardhani, Roro Aditya Novi, et al. “EKSISTENSI PEMBELAJARAN PROBLEM BASED LEARNING (PBL) DI MASA PEMBELAJARAN DARING DI SEKOLAH PONDOK JEMBER”. Education Journal : Journal Educational Research and Development, vol. 6, no. 1, Jan. 2022, pp. 21-28, doi:10.31537/ej.v6i1.628.