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