Gaya APA
Etika customer service. (2006).
Jakarta:
Rajagrafindo Persada.
Gaya Chicago
Etika customer service.
.
Jakarta:
Rajagrafindo Persada,
2006.
Text.
Gaya MLA
Etika customer service.
.
Jakarta:
Rajagrafindo Persada,
2006.
Text.
Gaya Turabian
Etika customer service.
Jakarta:
Rajagrafindo Persada,
2006.
Print.