APA (7th ed.) Citation

World Health Organization. (2007). International travel and health: Situation as on 1 January 2007. World Health Organization.

Chicago Style (17th ed.) Citation

World Health Organization. International Travel and Health: Situation as on 1 January 2007. Geneva: World Health Organization, 2007.

MLA (8th ed.) Citation

World Health Organization. International Travel and Health: Situation as on 1 January 2007. World Health Organization, 2007.