United States. Environmental Protection Agency. Office of Air Quality Planning and Standards. (2010). Policy assessment for the review of the secondary national ambient air quality standards for NOx and SOx: Second external review draft. U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards, Health and Environmental Impacts Division.
Chicago Style (17th ed.) CitationUnited States. Environmental Protection Agency. Office of Air Quality Planning and Standards. Policy Assessment for the Review of the Secondary National Ambient Air Quality Standards for NOx and SOx: Second External Review Draft. Research Triangle Park, N.C.: U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards, Health and Environmental Impacts Division, 2010.
MLA (9th ed.) CitationUnited States. Environmental Protection Agency. Office of Air Quality Planning and Standards. Policy Assessment for the Review of the Secondary National Ambient Air Quality Standards for NOx and SOx: Second External Review Draft. U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards, Health and Environmental Impacts Division, 2010.