APA (7th ed.) Citation

ZEMKE. (2001). E-service: 24 ways to keep your customers when the competition is just a click away. Amacom.

Chicago Style (17th ed.) Citation

ZEMKE. E-service: 24 Ways to Keep Your Customers When the Competition Is Just a Click Away. New York: Amacom, 2001.

MLA (9th ed.) Citation

ZEMKE. E-service: 24 Ways to Keep Your Customers When the Competition Is Just a Click Away. Amacom, 2001.