FAUZIAH AMARANI; SUGIANTO; MUHAMMAD LATHIEF ILHAMY NASUTION. The Effect of Self-Efficacy and Self-Concept on Increasing Optimism in Achieving Targets in Employees of Bank Syariah Indonesia (BSI) Case Study of BSI KCP Medan Aksara . Jurnal Manajemen Bisnis, [S. l.], v. 11, n. 2, p. 985–998, 2024. DOI: 10.33096/jmb.v11i2.893. Disponível em: https://jurnal.fe.umi.ac.id/index.php/JMB/article/view/893. Acesso em: 18 apr. 2025.