Gaya APA
CHA, D, A, B, S.
(2008).
Front Office Operations
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yogyakarta:
C.V ANDI OFFSET.
Gaya MLA
CHA, Drs., A., Bambang, Sujatno,.
"Front Office Operations".
yogyakarta:
C.V ANDI OFFSET,
2008.
BUKU.