Gaya APA

Windasuri, H., Susanti, H. (2016). Excellent service : the secrets of building a service organization . Jakarta: GPU (Gramedia Pustaka Utama).

Gaya MLA

Windasuri, Heria., Susanti, Hyacintha. "Excellent service : the secrets of building a service organization". Jakarta: GPU (Gramedia Pustaka Utama), 2016. Text.