SUDIRMAN, Didi Wahyu. Pengembangan Sikap Positif Manajer. Efisiensi : Kajian Ilmu Administrasi, [S. l.], v. 3, n. 1, 2015. DOI: 10.21831/efisiensi.v3i1.3788. Disponível em: https://jurnal.uny.ac.id/index.php/efisiensi/article/view/3788. Acesso em: 10 jun. 2025.