Gaya APA
Poynter, James M. (1990).
Corporate travel management .
New Jersey:
Prentice-Hall.
Gaya Chicago
Poynter, James M.
Corporate travel management.
New Jersey:
Prentice-Hall,
1990.
Buku.
Gaya MLA
Poynter, James M.
Corporate travel management.
New Jersey:
Prentice-Hall,
1990.
Buku.
Gaya Turabian
Poynter, James M.
Corporate travel management.
New Jersey:
Prentice-Hall,
1990.
Buku.