Sewell, C., & Brown, P. B. (2002). Customers for Life: How to Turn that One-time Buyer into a Lifetime Customer. Crown.
Chicago-referens (17:e uppl.)Sewell, Carl, och Paul B. Brown. Customers for Life: How to Turn That One-time Buyer into a Lifetime Customer. New York: Crown, 2002.
MLA-referens (9:e uppl.)Sewell, Carl, och Paul B. Brown. Customers for Life: How to Turn That One-time Buyer into a Lifetime Customer. Crown, 2002.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.