Hidayat, H, Z Ardi, S Herawati, Khairul ., and Z Amrina. 2019. “The Contribution of Internal Locus of Control and Self-Concept to Career Maturity in Vocational Higher Education”. KnE Social Sciences 3 (15), 234–248. https://doi.org/10.18502/kss.v3i15.4370.