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 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
T. E. Lawrence (2015). “Lawrence of Arabia: The Man Behind the Myth (Complete Autobiographical Works, Memoirs & Letters): Seven Pillars of Wisdom (Memoirs of the Arab Revolt) + The Evolution of a Revolt + The Mint (Memoirs of the secret service in Royal Air Force) + Collected Letters (1915-1935)”, p.59, e-artnow