Gaya APA

Zemke, Ron, Connellan, Tom. (2001). E-service : 24 ways to keep your customers when the competition is just a click away . New York: AMACOM.

Gaya Chicago

Zemke, Ron, Connellan, Tom. E-service : 24 ways to keep your customers when the competition is just a click away. New York: AMACOM, 2001. Buku.

Gaya MLA

Zemke, Ron, Connellan, Tom. E-service : 24 ways to keep your customers when the competition is just a click away. New York: AMACOM, 2001. Buku.

Gaya Turabian

Zemke, Ron, Connellan, Tom. E-service : 24 ways to keep your customers when the competition is just a click away. New York: AMACOM, 2001. Buku.