World Health Organization & ebrary, Inc. (2009). International travel and health: Situation as on 1 January 2009. World Health Organization.
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Lua i Stíl Chicago (17ú heag.)
World Health Organization agus Inc ebrary. International Travel and Health: Situation as on 1 January 2009. Geneva: World Health Organization, 2009.
Cóipeáladh chuig an ngearrthaisce go rathúil é
Níorbh fhéidir cóipeáil chuig an ngearrthaisce
Lua MLA (9ú heag.)
World Health Organization agus Inc ebrary. International Travel and Health: Situation as on 1 January 2009. World Health Organization, 2009.
Cóipeáladh chuig an ngearrthaisce go rathúil é
Níorbh fhéidir cóipeáil chuig an ngearrthaisce
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.