Pramono, W., E. Sugiyanto, and C. Prasetyo. “The Overview of Satisfaction Level of Online Learning System Student During Covid 19 Pandemic”. Proceedings of the International Conference on Nursing and Health Sciences, Vol. 1, no. 1, Dec. 2020, pp. 107-12, https://www.jurnal.globalhealthsciencegroup.com/index.php/PICNHS/article/view/300.