Nazara, S., P. F. Hulu, Y. Mendrofa, and A. Telaumbanua. “Influence of Standard Operational Procedures on Employee Performance in Technical Preparation for Public Order and Community Tranquility at the Regional Civil Service Police Unit of North Nias District”. ProBisnis : Jurnal Manajemen, vol. 15, no. 2, Apr. 2024, pp. 155-60, http://ejournal.joninstitute.org/index.php/ProBisnis/article/view/489.