Sadid, Septiyan Mudhiya, et al. “Spam Filtering On User Feedback Via Text Classification Using Multinomial Naí¯ve Bayes And TF-IDF”. Ultimatics : Jurnal Teknik Informatika, vol. 13, no. 2, Jan. 2022, pp. 108-13, doi:10.31937/ti.v13i2.2149.