Poynter, J. M. (1990). Corporate travel management. Prentice-Hall.
Chicago Style aipamenaPoynter, James M. Corporate Travel Management. Englewood Cliffs, N.J: Prentice-Hall, 1990.
MLA aipamenaPoynter, James M. Corporate Travel Management. Prentice-Hall, 1990.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.