APA (7th ed.) Zitazioa
Walker, S. (2009). Travel resources: An annotated guide. Scarecrow Press.
Chicago Style (17th ed.) Zitazioa
Walker, Stephen. Travel Resources: An Annotated Guide. Lanham, Md.: Scarecrow Press, 2009.
MLA (9th ed.) Zitazioa
Walker, Stephen. Travel Resources: An Annotated Guide. Scarecrow Press, 2009.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.