Cita APA (7th ed.)
World Health Organization & ebrary, Inc. (2008). International travel and health: Situation as on 1 January 2008. World Health Organization.
Cita Chicago (17th ed.)
World Health Organization i Inc ebrary. International Travel and Health: Situation as on 1 January 2008. Geneva: World Health Organization, 2008.
Cita MLA (9th ed.)
World Health Organization i Inc ebrary. International Travel and Health: Situation as on 1 January 2008. World Health Organization, 2008.
Atenció: Aquestes cites poden no estar 100% correctes.