Citazione Stile APA (7a Edizione)
World Health Organization & ebrary, Inc. (2009). International travel and health: Situation as on 1 January 2009. World Health Organization.
Citazione stile Chigago Style (17a edizione)
World Health Organization e Inc ebrary. International Travel and Health: Situation as on 1 January 2009. Geneva: World Health Organization, 2009.
Citatione MLA (9a ed.)
World Health Organization e Inc ebrary. International Travel and Health: Situation as on 1 January 2009. World Health Organization, 2009.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.