Théodore, T., MEVA’A, L., Kenmeugne, B., & Jammeh, P. T. (2017). Repair and Maintenance Cost Analysis of John Deere 5403 Tractor in the Gambia. American Scientific Research Journal for Engineering, Technology, and Sciences, 38(2), 214-225. https://asrjetsjournal.org/American_Scientific_Journal/article/view/3619