Siagian, Christian, Eunike Surbakti, and Yaman Khaeruzzaman. “Recommendation System Coffee Shop Using AHP and TOPSIS Methods”. Ultimatics : Jurnal Teknik Informatika 16, no. 1 (July 8, 2024): 46-53. Accessed December 22, 2024. https://ejournals.umn.ac.id/index.php/TI/article/view/3579.