APA (7th ed.) Citation

(1997). Emission standards reference guide for heavy-duty and nonroad engines. United States Environmental Protection Agency, Air and Radiation.

Chicago Style (17th ed.) Citation

Emission Standards Reference Guide for Heavy-duty and Nonroad Engines. [Washington, D.C.]: United States Environmental Protection Agency, Air and Radiation, 1997.

MLA (9th ed.) Citation

Emission Standards Reference Guide for Heavy-duty and Nonroad Engines. United States Environmental Protection Agency, Air and Radiation, 1997.