Indrayana, Boy, and Ali Sadikin. 2020. “Penerapan E-Learning Di Era Revolusi Industri 4.0 Untuk Menekan Penyebaran Covid-19 : (The Application of E-Learning in the Era of the Industrial Revolution 4.0 to Suppress the Spread of Covid-19)”. Indonesian Journal of Sport Science and Coaching 2 (1):46-55. https://doi.org/10.22437/ijssc.v2i1.9847.