Gaya APA

WINDASARI, H., SUSANTI, H. (2017). EXCELLENT SERVICE : THE SECRET OF BUILDING A SERVICE ORGANIZATION . JAKARTA: PT. Gramedia Pustaka Utama.

Gaya MLA

WINDASARI, HERIA., SUSANTI, HYACINTHA. "EXCELLENT SERVICE : THE SECRET OF BUILDING A SERVICE ORGANIZATION". JAKARTA: PT. Gramedia Pustaka Utama, 2017. Text.