H. Hidayat, B. Y. Tamin, S. Herawati, Z. Ardi, and A. P. Muji, “The Contribution of Internal Locus of Control and Self-Concept to Career Maturity in Engineering Education”, Int. J. Adv. Sci. Eng. Inf. Technol., vol. 10, no. 6, pp. 2282–2289, Dec. 2020.