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