Gaya APA

TSCHOHL, J. (2003). ACHIEVING EXCELLENCE THROUGH CUSTOMER SERVICE: UNGGUL BERSAING MELALUI LAYANAN PELANGGAN . JAKARTA: Gramedia Pustaka Utama.

Gaya MLA

TSCHOHL, JOHN. "ACHIEVING EXCELLENCE THROUGH CUSTOMER SERVICE: UNGGUL BERSAING MELALUI LAYANAN PELANGGAN". JAKARTA: Gramedia Pustaka Utama, 2003. Nontext.