1. R. H. Huang, D. J. Liu, A. Tlili, J. F. Yang, & H. H. Wang, Handbook on facilitating flexible learning during educational disruption: The Chinese experience in maintaining undisrupted learning in COVID-19 Outbreak (Smart Learning Institute of Beijing Normal University, Beijing, 2020) pp. 1–54.
2. R. Oktavian and R. F. Aldya, Didaktis: Jurnal Pendidikan dan Ilmu Pengetahuan, 20, 129–135 (2020).
3. R. C. Clark and R. E. E. Mayer, Learning and the Science of Instruction, (Jossey-Bass, California, 2003).
4. A. J. Henderson, The E-Learning Question and Answer Book: A Survival Guide for Trainers and Business Managers (American Management Association, New York, 2003).
5. GTPP Covid-19, “Protokol Percepatan Penanganan Pandemi Covid-19 (Corona Virus Disease 2019)”, Retrieved from https://covid19.go.id/p/protokol/protokol-percepatan-penanganan-pandemi-covid-19-corona-virus-disease-2019, 2020.