Nurdianto, Dian, et al. “To Evaluate The Performance Of Certification Competence Vocational Students Through Certification Institute Profesi-P1 Program Computer Engineering Expertise And Tissues At South Sumatra”. Jurnal Pendidikan Tambusai, vol. 5, no. 1, Aug. 2021, pp. 2370-3, doi:10.31004/jptam.v5i1.1687.