Jeffrey H. Gitomer (1998). “Customer Satisfaction is Worthless, Customer Loyalty is Priceless: How to Make Customers Love You, Keep Them Coming Back and Tell Everyone They Know”, Bard
Jeffrey Gitomer, Jeffrey H. Gitomer (2007). “Jeffrey Gitomer's Little Platinum Book of Cha-ching!: 32.5 Strategies to Ring Your Own (cash) Register of Business and Personal Success”, Ft Press