APA aipamena

World Health organization. (2012). International travel and health. World Health Organization.

Chicago Style aipamena

World Health organization. International Travel and Health. Geneva, Switzerland: World Health Organization, 2012.

MLA aipamena

World Health organization. International Travel and Health. World Health Organization, 2012.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.