Salsabila, S., J. Jondri, and W. Astuti. “Analysis of Community Sentiment on Twitter towards COVID-19 Vaccine Booster Using Ensemble Stacking Methods”. Building of Informatics, Technology and Science (BITS), Vol. 4, no. 2, Sept. 2022, pp. 467-73, doi:10.47065/bits.v4i2.1902.