APA aipamena

Harold L. Vogel. (2012). Travel Industry Economics (2.). Cambridge University Press.

Chicago Style aipamena

Harold L. Vogel. Travel Industry Economics. 2. Cambridge University Press, 2012.

MLA aipamena

Harold L. Vogel. Travel Industry Economics. 2. Cambridge University Press, 2012.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.