Gaya APA
Rangkuti, F. (2013).
Customer Service Satisfaction & Call Center Berdasarkan Iso 9001 .
Jakarta:
Gramedia Pustaka.
Gaya MLA
Rangkuti, Freddy.
"Customer Service Satisfaction & Call Center Berdasarkan Iso 9001".
Jakarta:
Gramedia Pustaka,
2013.
Text.