1. R. Gay, A. Charlesworth and R. Esen, Online Marketing: A Customer-Led Approach. Oxford: Oxford University Press, 2007.
2. Battelle, J., The Search. London: Nicholas Brealey Publishing, 2005.
3. R. Gay, A. Charlesworth and R. Esen, Online Marketing: A Customer-Led Approach. Oxford: Oxford University Press, 2007.
4. De Kare Silver, M., E-shock. Basingstoke: Palgrave Macmillan, 1998.