NELVARA, Elva; KUSUMIATI, Ratriana Yuliastuti Endang. Hubungan Antara Optimisme dengan Produktivitas Kerja Pada Driver Jeggboy&Girl Salatiga. Innovative: Journal Of Social Science Research, [S. l.], v. 4, n. 3, p. 8888–8895, 2024. DOI: 10.31004/innovative.v4i3.11402. Disponível em: http://j-innovative.org/index.php/Innovative/article/view/11402. Acesso em: 2 aug. 2026.