K. Kamau, Simon, Dr. Hannah O. Bula, and James O. Oringo. “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, no. 1 (December 4, 2018): 175–191. Accessed December 4, 2023. https://www.asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/4513.