Siagian, C., E. Surbakti, and Y. Khaeruzzaman. “Recommendation System Coffee Shop Using AHP and TOPSIS Methods”. Ultimatics : Jurnal Teknik Informatika, Vol. 16, no. 1, July 2024, pp. 46-53, doi:https://doi.org/10.31937/ti.v16i1.3579.