NDRAHA, D.; WARUWU, S.; HULU, F.; WARUWU, M. H. The Impact of Planning on Employee Productivity at PT Narindo Solusi Telekomunikasi in Gunungsitoli City. ProBisnis : Jurnal Manajemen, [S. l.], v. 15, n. 2, p. 223–227, 2024. Disponível em: https://ejournal.joninstitute.org/index.php/ProBisnis/article/view/512. Acesso em: 18 apr. 2026.