Gaya APA
Anugrah, A., Mulchias, A.
(2011).
First step to contact center services
.
Jakarta:
Telexindo Bizmart.
Gaya MLA
Anugrah, Andi., Mulchias, Asa.
"First step to contact center services".
Jakarta:
Telexindo Bizmart,
2011.
Text.