Cita APA (7a ed.)

World Health Organization & ebrary, Inc. (2006). Air quality guidelines: Global update 2005 : particulate matter, ozone, nitrogen dioxide, and sulfur dioxide. World Health Organization.

Cita Chicago Style (17a ed.)

World Health Organization y Inc ebrary. Air Quality Guidelines: Global Update 2005 : Particulate Matter, Ozone, Nitrogen Dioxide, and Sulfur Dioxide. Copenhagen, Denmark: World Health Organization, 2006.

Cita MLA (9a ed.)

World Health Organization y Inc ebrary. Air Quality Guidelines: Global Update 2005 : Particulate Matter, Ozone, Nitrogen Dioxide, and Sulfur Dioxide. World Health Organization, 2006.