Cristover, Ronaldo, Hapnes Toba, and Bernard Renaldy Suteja. “Segmentation and Formation of Customer Regression Model Based on Recency, Frequency and Monetary Analysis”. Jurnal Teknik Informatika dan Sistem Informasi 8, no. 2 (August 31, 2022): 474 –. Accessed January 30, 2023. https://journal.maranatha.edu/index.php/jutisi/article/view/5075.