Puteri, Aida Gustika, and R.M.Herdian Bhakti. “Penggunaan Certainty Factor Dalam Sistem Pakar Diagnosa Penyakit Jerawat”. Jurnal Ilmiah Intech : Information Technology Journal of UMUS, vol. 1, no. 02, Nov. 2019, pp. 86-96, doi:10.46772/intech.v1i02.72.