Indrayana, B., and A. Sadikin. “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, vol. 2, no. 1, Feb. 2020, pp. 46-55, doi:10.22437/ijssc.v2i1.9847.