APA
Greiner D., . (1999). 1,001 Ways to Keep Customers Coming Back. : Three Rivers Press.
Chicago
Greiner Donna, . 1999. 1,001 Ways to Keep Customers Coming Back. : Three Rivers Press.
Harvard
Greiner D., . (1999). 1,001 Ways to Keep Customers Coming Back. : Three Rivers Press.
MLA
Greiner Donna, . 1,001 Ways to Keep Customers Coming Back. : Three Rivers Press. 1999.