Gaya APA
Davidson, Rob. (2003).
Business Travel .
New York:
Prentice Hall.
Gaya Chicago
Davidson, Rob.
Business Travel.
New York:
Prentice Hall,
2003.
Buku Teks.
Gaya MLA
Davidson, Rob.
Business Travel.
New York:
Prentice Hall,
2003.
Buku Teks.
Gaya Turabian
Davidson, Rob.
Business Travel.
New York:
Prentice Hall,
2003.
Buku Teks.