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