Renaldy Suteja, Bernard, Suryo Guritno, Retantyo Wardoyo, and Ahmad Ashari. 2009. “SISTEM ONTOLOGI E-LEARNING BERBASIS SEMANTIC WEB”. Jurnal Ilmu Komputer Dan Informasi 2 (1), 1-9. https://doi.org/10.21609/jiki.v2i1.120.