Siswanto, S., Dewi Yustiana, Koen Irianto Uripan, Sutomo, S. and Siti Nur Soleha 2026. The Effect of Competency Certification on Employee Performance with Competency Testing as a Variable Mediation (Study at PT. X). Jurnal Ekonomi. 15, 01 (Jan. 2026), 14–29.