United States. Environmental Protection Agency. Office of Transportation and Air Quality. (1999). Blue Sky Series engines. U.S. Environmental Protection Agency, Air and Radiation, Office of Transportation and Air Quality.
Chicago Style (17th ed.) CitationUnited States. Environmental Protection Agency. Office of Transportation and Air Quality. Blue Sky Series Engines. [Washington, D.C.]: U.S. Environmental Protection Agency, Air and Radiation, Office of Transportation and Air Quality, 1999.
MLA (9th ed.) CitationUnited States. Environmental Protection Agency. Office of Transportation and Air Quality. Blue Sky Series Engines. U.S. Environmental Protection Agency, Air and Radiation, Office of Transportation and Air Quality, 1999.
Warning: These citations may not always be 100% accurate.