Gaya APA
Abbey, J, R. (2016).
Covention Management And Service (Ninth Edition).
Amerika:
AHLEI (American Hotel & Loging Educational Institue.
Gaya MLA
Abbey, James, R..
"Covention Management And Service".
Ninth Edition
Amerika:
AHLEI (American Hotel & Loging Educational Institue,
2016.
BUKU.