K. Kamau, S., O. Bula, D. H., & O. Oringo, J. (2018). Challenges of Performance Appraisal Implementation and their Effects on Service Delivery in Public Secondary Schools in Githunguri Sub-county of Kiambu County, Kenya. American Scientific Research Journal for Engineering, Technology, and Sciences, 49(1), 175–191. Retrieved from https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/4513