Sari, Meida Wulan, et al. “THE EFFECTIVENESS OF LEARNING VIDEO USAGE TO SUPPORT ONLINE LEARNING IN BASIC CHEMISTRY COURSE DURING THE COVID-19 PANDEMIC”. JPPIPA (Jurnal Penelitian Pendidikan IPA), vol. 6, no. 1, June 2021, pp. 25-30, doi:10.26740/jppipa.v6n1.p25-30.