Shehu I, Ochala M, Nwogwugwu N. Performance Appraisal Systems and Institutional Effectiveness: Evidence from Administration Practices in Nigeria Immigration Service. acopen [Internet]. 2026 Jun. 1 [cited 2026 Jun. 9];11(1):10.21070/acopen.11.2026.14654. Available from: https://acopen.umsida.ac.id/index.php/acopen/article/view/14654