Citazione Stile APA (7a Edizione)
World Health Organization & ebrary, Inc. (2008). International travel and health: Situation as on 1 January 2008. World Health Organization.
Citazione stile Chigago Style (17a edizione)
World Health Organization e Inc ebrary. International Travel and Health: Situation as on 1 January 2008. Geneva: World Health Organization, 2008.
Citatione MLA (9a ed.)
World Health Organization e Inc ebrary. International Travel and Health: Situation as on 1 January 2008. World Health Organization, 2008.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.