Gaya APA
Etika Customer Service. (2008).
Jakarta:
[s.n.].
Gaya Chicago
Etika Customer Service.
.
Jakarta:
[s.n.],
2008.
Text.
Gaya MLA
Etika Customer Service.
.
Jakarta:
[s.n.],
2008.
Text.
Gaya Turabian
Etika Customer Service.
Jakarta:
[s.n.],
2008.
Print.