Bastian, Ade, et al. “Sentiment Analysis Against Political Figure’s Billboard During Pandemic Using Naïve Bayes Algorithm ”. Jurnal RESTI (Rekayasa Sistem Dan Teknologi Informasi), vol. 7, no. 1, Feb. 2023, pp. 138-45, https://doi.org/10.29207/resti.v7i1.4643.