Sakti, R.H. dan Sukardi, S. 2021. Empirical Effect: Flipped Classroom-Based E-Learning to Face Learning on Covid-19 Pandemic. Jurnal Pendidikan dan Pengajaran. 54, 1 (Apr 2021), 1–8. DOI:https://doi.org/10.23887/jpp.v54i1.31645.