1. Anderson, J.C. and Narus, J.A. (1995), “Capturing the value of supplementary services”, Harvard Business Review, Vol. 73 No. 3, pp. 75‐83.
2. The psychology of sunk cost
3. The Customer Contact Approach to Services: Theoretical Bases and Practical Extensions
4. Behavioral Decision Theory: Processes of Judgement and Choice
5. Eisenhardt, K.M. (1989), “Building theories from case study research”, Academy of Management Review, Vol. 14 No. 4, pp. 532‐50.