6Berger Path D and Nada L Nasr, 1998, Customer Lifetime Value: Marketing Models and Applications, Journal of Interactive Marketing , 12 (1) , 17- 30.
7Bhattacharya, C B, 1998, When Customers are Members. Customer Retention in Paid Membership Contexts, Journal of the Academy of Marketing Science, 26 (1) , 31-44.
8Griffin, Jill, 1995, Customer Loyalty, Jossey-Bass Inc.
9Ruth N.Bolton, Douglas Bowman, Elten Briggs, V.Kumar, A.2002, Parasuraman and Creed Terry, Marketing Actions and the Value of Customer Assets, Journal of Service Research, 5 (1) , 39-54.
10R Blattberg and J Deighton, 1996, Manage Marketing by the Customer Equity Test, Harvard Business Review, July- August.