United States. Environmental Protection Agency. Office of Air Quality Planning and Standards & Research Triangle Institute. (1999). The plain language implementation assistance document for 40 CFR 63 subpart DD: (National Emission Standards for Hazardous Air Pollutants from Off-Site Waste and Recovery Operations). U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards.
Chicago Style (17th ed.) CitationUnited States. Environmental Protection Agency. Office of Air Quality Planning and Standards and Research Triangle Institute. The Plain Language Implementation Assistance Document for 40 CFR 63 Subpart DD: (National Emission Standards for Hazardous Air Pollutants from Off-Site Waste and Recovery Operations). Research Triangle Park, N.C.: U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards, 1999.
MLA (9th ed.) CitationUnited States. Environmental Protection Agency. Office of Air Quality Planning and Standards and Research Triangle Institute. The Plain Language Implementation Assistance Document for 40 CFR 63 Subpart DD: (National Emission Standards for Hazardous Air Pollutants from Off-Site Waste and Recovery Operations). U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards, 1999.