Agboyi, Makafui R., et al. “An Evaluation of Vehicle Component Procurement on the Performance of Road Transportation, A Study of Public Bus Transit, Ghana”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 17, no. 1, Dec. 2014, pp. 401-16, https://www.gssrr.org/JournalOfBasicAndApplied/article/view/3086.