Ndruru, R. R., Zega, Y., Telaumbanua, E. and Waruwu, S. (2025) “Analysis of Additional Employee Income Provisions in Improve Employee Performance at The Ulunoyo District Office South Nias Regency”, ProBisnis : Jurnal Manajemen, 16(5), pp. 1192–1196. Available at: https://ejournal.joninstitute.org/index.php/ProBisnis/article/view/1139 (Accessed: 5 August 2026).