Gaya APA
Windasuri, H., Susanti, H.
(2017).
Excellent Service
(
1)
.
Jakarta:
PT Gramedia Pustaka.
Gaya MLA
Windasuri, Heria., Susanti, Hyacintha.
"Excellent Service".
1
Jakarta:
PT Gramedia Pustaka,
2017.
Buku.