Agustono, Efid Dwi, et al. “ANALISIS SENTIMEN TERHADAP WARGA CHINA SAAT PANDEMI DENGANALGORITMATERM FREQUENCY-INVERSE DOCUMENT FREQUENCY DAN SUPPORT VECTOR MACHINE”. Jurnal Informatika Dan Rekayasa Elektronik, vol. 3, no. 2, Nov. 2020, pp. 111-9, http://e-journal.stmiklombok.ac.id/index.php/jire/article/view/258.