Ahmad , A. . “Sistem Penilaian Kinerja Karyawan Menggunakan Fuzzy Inference System Metode Mamdani”. Scientia Sacra: Jurnal Sains, Teknologi Dan Masyarakat, vol. 1, no. 3, Dec. 2021, pp. 250-8, http://pijarpemikiran.com/index.php/Scientia/article/view/96.