United States. Environmental Protection Agency. Office of Transportation and Air Quality. Assessment and Standards Division & ICF Consulting. (2004). Update of methane and nitrous oxide emission factors for on-highway vehicles. United States Environmental Protection Agency, Office of Transportation and Air Quality.
Chicago Style (17th ed.) CitationUnited States. Environmental Protection Agency. Office of Transportation and Air Quality. Assessment and Standards Division and ICF Consulting. Update of Methane and Nitrous Oxide Emission Factors for On-highway Vehicles. [Washington, D.C.]: United States Environmental Protection Agency, Office of Transportation and Air Quality, 2004.
MLA (9th ed.) CitationUnited States. Environmental Protection Agency. Office of Transportation and Air Quality. Assessment and Standards Division and ICF Consulting. Update of Methane and Nitrous Oxide Emission Factors for On-highway Vehicles. United States Environmental Protection Agency, Office of Transportation and Air Quality, 2004.