Gaya APA
Davidoff, Philip G. (1987).
Air Fares ticketing third edition .
New Jersey:
Prentice Hall.
Gaya Chicago
Davidoff, Philip G.
Air Fares ticketing third edition.
New Jersey:
Prentice Hall,
1987.
Text.
Gaya MLA
Davidoff, Philip G.
Air Fares ticketing third edition.
New Jersey:
Prentice Hall,
1987.
Text.
Gaya Turabian
Davidoff, Philip G.
Air Fares ticketing third edition.
New Jersey:
Prentice Hall,
1987.
Print.