APA (7th ed.) Citation

(1979). Portland study element. U.S. Environmental Protection Agency, Office of Mobile Source Air Pollution Control, Emission Control Technology Division.

Chicago Style (17th ed.) Citation

Portland Study Element. Ann Arbor, Michigan: U.S. Environmental Protection Agency, Office of Mobile Source Air Pollution Control, Emission Control Technology Division, 1979.

MLA (9th ed.) Citation

Portland Study Element. U.S. Environmental Protection Agency, Office of Mobile Source Air Pollution Control, Emission Control Technology Division, 1979.

Warning: These citations may not always be 100% accurate.