Cita APA (7a ed.)

World Health Organization. (2021). WHO global air quality guidelines: Articulate matter (‎PM2.5 and PM10)‎, ozone, nitrogen dioxide, sulfur dioxide and carbon monoxide. WHO.

Cita Chicago Style (17a ed.)

World Health Organization. WHO Global Air Quality Guidelines: Articulate Matter (‎PM2.5 and PM10)‎, Ozone, Nitrogen Dioxide, Sulfur Dioxide and Carbon Monoxide. Ginebra: WHO, 2021.

Cita MLA (8a ed.)

World Health Organization. WHO Global Air Quality Guidelines: Articulate Matter (‎PM2.5 and PM10)‎, Ozone, Nitrogen Dioxide, Sulfur Dioxide and Carbon Monoxide. WHO, 2021.