Patabang, Irmawati, et al. “The Application of Problem Based Learning Models With E-Learning During the Covid-19 Pandemic to Students’ Science Process Skills of Class XI IPA Students at SMA Santo Paulus Manokwari”. Kasuari: Physics Education Journal (KPEJ), vol. 3, no. 2, Dec. 2020, pp. 118-27, doi:10.37891/kpej.v3i2.154.