“SISTEM PAKAR METODE CERTAINTY FACTOR DALAM DIAGNOSA PENYAKIT KANKER KELENJAR GETAH BENING PADA RSUD H. ABDUL MANAN SIMATUPANG”. JOURNAL OF SCIENCE AND SOCIAL RESEARCH, vol. 4, no. 2, June 2021, p. 155 –162, https://doi.org/10.54314/jssr.v4i2.548.