APA (7th ed.) Citation

(1989). User's guide to MOBILE4 (Mobile Source Emission Factor Model). U.S. Environmental Protection Agency, Office of Air and Radiation, Office of Mobile Sources, Emission Control Technology Division, Test and Evaluation Branch.

Chicago Style (17th ed.) Citation

User's Guide to MOBILE4 (Mobile Source Emission Factor Model). Ann Arbor, Michigan: U.S. Environmental Protection Agency, Office of Air and Radiation, Office of Mobile Sources, Emission Control Technology Division, Test and Evaluation Branch, 1989.

MLA (9th ed.) Citation

User's Guide to MOBILE4 (Mobile Source Emission Factor Model). U.S. Environmental Protection Agency, Office of Air and Radiation, Office of Mobile Sources, Emission Control Technology Division, Test and Evaluation Branch, 1989.