Buulolo, S., E. Waruwu, H. Gulo, N. A. Buulolo, and F. Halawa. “The Effect of Service Leadership and Coworker Support on Employee Retention at Ulunoyo Community Health Center South Nias Regency”. ProBisnis : Jurnal Manajemen, vol. 16, no. 5, Oct. 2025, pp. 1223-9, https://www.ejournal.joninstitute.org/index.php/ProBisnis/article/view/1144.