Παραπομπή APA
Gram, T. (2001). Customers that count: How to build living relationships with your most valuable customers. London: Financial Times Prentice Hall.
Παραπομπή Chicago StyleGram, Tony. Customers That Count: How to Build Living Relationships With Your Most Valuable Customers. London: Financial Times Prentice Hall, 2001.
Παραπομπή MLAGram, Tony. Customers That Count: How to Build Living Relationships With Your Most Valuable Customers. London: Financial Times Prentice Hall, 2001.
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