Gaya APA
Sugiarto, E., Kowa, F. (1997).
Operasional kantor depan hotel / hotel front office operationals .
Jakarta:
PT Gramedia Pustaka Utama.
Gaya MLA
Sugiarto, Endar., Kowa, Frans.
"Operasional kantor depan hotel / hotel front office operationals".
Jakarta:
PT Gramedia Pustaka Utama,
1997.
BUKU.