D. W. . Siregar, Husen Saeful Insan, Sutaryat Trisnamansyah, and Waska Warta, “Strategies to Increase Teacher Competency in Efforts to Generate Vocational School Graduates According to Standards of Business and Industry (DUDI)”, JOES, vol. 3, no. 1, pp. 1–10, Jun. 2019.