Illia, F., M. P. Eugenia, and S. A. Rutba. “Sentiment Analysis on PeduliLindungi Application Using TextBlob and VADER Library”. Proceedings of The International Conference on Data Science and Official Statistics, vol. 2021, no. 1, Jan. 2022, pp. 278-8, doi:10.34123/icdsos.v2021i1.236.