Atakpa, M., S. Ocheni, and B. C. Nwankwo. “Review of Performance Appraisal and Objective Assessment of Subordinate Officers in Nigeria”. International Journal of Public Administration and Management Research , vol. 2, no. 1, July 2021, pp. 39-47, https://journals.rcmss.com/index.php/ijpamr/article/view/113.