1. Butler, P. (1997) A revolution in interaction, McKinsey Quarterly, No. 1.
2. Chanders, A., Graham, J. and Williamson, R. (1985) Dictionary of Computers,. London: Penguin.
3. Comer, J.M. (1975) The computer, personal selling and sales management, Journal of Marketing, 39, (3): 27–33.
4. Deans, K.R. (1990) In Macmillan Dictionary of Marketing and Advertising,. London: Macmillan Press.
5. Donaldson, B. and Domegan, C.T. (1992) Customer service and information technology, Journal of Information Technology, 7,: 203–212.