Library of Congress. Congressional Research Service & ProQuest (Firm). (2007). Particulate Matter (PM2.5): Implementation of the 1997 National Ambient Air Quality Standards (NAAQS). [publisher not identified].
Chicago Style (17th ed.) CitationLibrary of Congress. Congressional Research Service and ProQuest (Firm). Particulate Matter (PM2.5): Implementation of the 1997 National Ambient Air Quality Standards (NAAQS). [Place of publication not identified]: [publisher not identified], 2007.
MLA (9th ed.) CitationLibrary of Congress. Congressional Research Service and ProQuest (Firm). Particulate Matter (PM2.5): Implementation of the 1997 National Ambient Air Quality Standards (NAAQS). [publisher not identified], 2007.
Warning: These citations may not always be 100% accurate.