Harding, K. (1999). Going international English for tourism. Oxford: Oxford University Press.
Chicago Style aipamenaHarding, Keith. Going International English for Tourism. Oxford: Oxford University Press, 1999.
MLA aipamenaHarding, Keith. Going International English for Tourism. Oxford: Oxford University Press, 1999.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.