Juwita, I., I. Kamil, J. Jonrinaldi, B. Yuliandra, and I. Halim. “Mastery of Skills 4.0 Effect on The Readiness of College Students in Facing Revolution of Industry 4.0”. Jurnal Optimasi Sistem Industri, vol. 19, no. 1, June 2020, pp. 1-11, doi:10.25077/josi.v19.n1.p1-11.2020.