Supangat, S., M. Saringat, and M. Rochman. “Predicting Handling Covid-19 Opinion Using Naive Bayes and TF-IDF for Polarity Detection”. MATRIK : Jurnal Manajemen, Teknik Informatika Dan Rekayasa Komputer, Vol. 22, no. 2, Mar. 2023, pp. 173-84, doi:https://doi.org/10.30812/matrik.v22i2.2227.