Gatitu, J. N., C. K. Kabubo, and P. Ajwang. 2020. “Approaches on Mitigating Variation Orders in Road Construction Industry in Kenya: The Case of Kenya National Highways Authority (KeNHA)”. Engineering, Technology & Applied Science Research 10 (5). Greece:6195-99. https://doi.org/10.48084/etasr.3737.