1. Aaker, D. A., Kumar, V., & Day, G. S. (2007). Marketing Research. USA: Wiley.
2. Arrive Alive (2011). Minibus taxis and road safety. Available at: http://www.arrivealive.co.za . Accessed 9 June 2011.
3. Barabino, B., Deiana, E., & Tilocca, P. (2012). Measuring service quality in urban bus transport: a modified SERVQUAL approach. International Journal of Quality and Service Sciences, 4(3), 238–252.
4. Button, K. J., & Hensher, D. A. (2001). Transportation systems. Handbook of Transportation Systems and Traffic Control, 3(1), 33–110.
5. Byrne, B. M. (2010). Structural equation modelling with EQS: basic concepts, applications, and programmes (2nd ed.). New Jersey: Erlbaum Publishing.