Cita APA (7a ed.)
(2000). Air quality guidelines for Europe (Second edition.). World Health Organization Regional Office for Europe.
Cita Chicago Style (17a ed.)
Air Quality Guidelines for Europe. Second edition. Copenhagen, Denmark: World Health Organization Regional Office for Europe, 2000.
Cita MLA (9a ed.)
Air Quality Guidelines for Europe. Second edition. World Health Organization Regional Office for Europe, 2000.
Precaución: Estas citas no son 100% exactas.