Gaya APA
Rangkuti, F. (2013).
Customer Service Satisfaction & Call Center Berdasarkan ISO 9001 (Cet.1).
Jakarta:
Gramedia Pustaka Utama.
Gaya MLA
Rangkuti, Freddy.
"Customer Service Satisfaction & Call Center Berdasarkan ISO 9001".
Cet.1
Jakarta:
Gramedia Pustaka Utama,
2013.
Text.