Saputra, Angga, and Budi Prasetiyo. 2024. “Sentiment Analysis on Twitter Social Media Regarding Covid-19 Vaccination With Naive Bayes Classifier (NBC) and Bidirectional Encoder Representations from Transformers (BERT)”. Recursive Journal of Informatics 2 (2), 106 -13. https://doi.org/10.15294/rji.v2i2.67502.