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. Retrieved from https://www.asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/3619