APA (7th ed.) Citation

(2004). Clean vehicles + clean fuel = cleaner air. United States Environmental Protection Agency.

Chicago Style (17th ed.) Citation

Clean Vehicles + Clean Fuel = Cleaner Air. [Washington, D.C.]: United States Environmental Protection Agency, 2004.

MLA (9th ed.) Citation

Clean Vehicles + Clean Fuel = Cleaner Air. United States Environmental Protection Agency, 2004.

Warning: These citations may not always be 100% accurate.