Citazione Stile APA (7a Edizione)
Global Environmental Monitoring System. (1991). Urban air pollution. United nations environment health.
Citazione stile Chigago Style (17a edizione)
Global Environmental Monitoring System. Urban Air Pollution. Nairobi: United nations environment health, 1991.
Citatione MLA (9a ed.)
Global Environmental Monitoring System. Urban Air Pollution. United nations environment health, 1991.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.