Dhamma, Mulia, Guinarto, Griselda, AND Khomulia, Levina. "Analisis Tingkat Kepuasaan Mahasiswa Terhadap Layanan Student Service Centre di Universitas Pelita Harapan Medan Dengan Metode Fuzzy Mamdami" Journal Information System Development (ISD) [Online], Volume 4 Number 1 (24 January 2019)