1. Ansoff, H. I. (1957). Strategies for diversification. Harvard Business Review, 35(5), 113–124.
2. Baldwin, J. N., Gauld, R., & Goldfinch, S. (2012). What public servants really think of E-government. Public Management Review, 14(1), 105–127.
3. Ballantyne, D., & Varey, R. J. (2006). Creating value-in-use through marketing interaction: the exchange logic of relating, communicating and knowing. Marketing Theory, 6(3), 335–348.
4. Bell, D. R., Gallino, S., Moreno, A. (2015). Offline Showrooms and Customer Migration in Omni-Channel Retail. The Effect of Product Information. Social Sience Research Network (SSRN). http://ssrn.com/abstract=2370535 , checked on 02/12/15.
5. Berry, L. L. (1980). Service marketing is different. Business Weekly, 30(May/June), 24–29.