Cita APA (7a ed.)
World Health Organization & ebrary, Inc. (2009). International travel and health: Situation as on 1 January 2009. World Health Organization.
Cita Chicago Style (17a ed.)
World Health Organization y Inc ebrary. International Travel and Health: Situation as on 1 January 2009. Geneva: World Health Organization, 2009.
Cita MLA (9a ed.)
World Health Organization y Inc ebrary. International Travel and Health: Situation as on 1 January 2009. World Health Organization, 2009.
Precaución: Estas citas no son 100% exactas.