Pajri, Dicki, Yuyun Umaidah, and Tesa Padilah. “K-Nearest Neighbor Berbasis Particle Swarm Optimization Untuk Analisis Sentimen Terhadap Tokopedia”. Jurnal Teknik Informatika dan Sistem Informasi 6, no. 2 (August 10, 2020). Accessed January 27, 2022. https://journal.maranatha.edu/index.php/jutisi/article/view/2658.