Gaya APA
Windasuri, H., Susanti, H.
(2017).
Excellent Service
.
Jakarta:
PT GRAMEDIA PUSTAKA UTAMA.
Gaya MLA
Windasuri, Heria., Susanti, Hyacintha.
"Excellent Service".
Jakarta:
PT GRAMEDIA PUSTAKA UTAMA,
2017.
Text.