Helmi, Yolla Rahmadi, Y Yuhandri, and Gunadi Widi Nurcahyo. 2021. “Expert System in Identifying Promotions for Civil Servants Using the Backward Chaining Method”. Jurnal Informasi Dan Teknologi 3 (4), 190-95. https://doi.org/10.37034/jidt.v3i4.149.