World Health organization. (2012). International travel and health. World Health Organization.
Lua i Stíl Chicago (17ú heag.)World Health organization. International Travel and Health. Geneva, Switzerland: World Health Organization, 2012.
Lua MLA (8ú heag.)World Health organization. International Travel and Health. World Health Organization, 2012.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.