1. Banasiewicz, A. (2005): Loyalty Program Planning and Analytics, in: Journal of Consumer Marketing, Jg. 22, Nr. 6, S. 332–339.
2. Blattberg, R.C.; Getz, G.; Thomas, J.S. (2001): Customer Equity, Harvard Business School Publishing Corporation, Boston.
3. Bolton, R.N.; Lemon, K.N.; Verhoef, S.C. (2004): The Theoretical Underpinnings of Customer Asset Management: A Framework and Propositions for Future Research, in: Journal of the Academy of Marketing Science, Jg. 32, Nr. 3, S. 271–292.
4. Breyer, M. (1997): Analyse des Nachkaufverhaltens als Folge der Zufriedenheit mit Finanzdienstleistungen, Peter Lang Verlag, Frankfurt a. M.
5. Buckinx, W.; Verstraeten, G.; Van Den Poel, D. (2005): Predicting Customer Loyalty Using The Internal Transactional Database, Working Paper Nr. 324, Ghent University, Faculty of Economics and Business Administration, Ghent.