APA (7th ed.) Citation

World Health Organization. (2008). International travel and health: Situation as on 1 January 2008. World Health Organization.

Chicago Style (17th ed.) Citation

World Health Organization. International Travel and Health: Situation as on 1 January 2008. Geneva: World Health Organization, 2008.

MLA (9th ed.) Citation

World Health Organization. International Travel and Health: Situation as on 1 January 2008. World Health Organization, 2008.