(2005). International travel and health: Situation as on 1 January 2005. World Health Organization.
Chicago-Zitierstil (17. Ausg.)International Travel and Health: Situation as on 1 January 2005. Geneva: World Health Organization, 2005.
MLA-Zitierstil (9. Ausg.)International Travel and Health: Situation as on 1 January 2005. World Health Organization, 2005.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.