1. Bishop , J.
Butler , G.
Dwyer , D.
Fabirkiewicz , S.
Nelson , B. and
Beusse , R. 2006. Progress Report on EPA's Nonroad Mobile Source Emissions Reduction Strategies, 01–03. Washington, DC: U.S. Environmental Protection Agency. 2006-P-00039
2. 2004. Exhaust and Crankcase Emissions Factors for Nonroad Engine Modeling—Compression-Ignition, 06–07. Washington, DC: U.S. Environmental Protection Agency.
3. Real-World In-Use Activity, Fuel Use, and Emissions for Nonroad Construction Vehicles: A Case Study for Excavators
4. 2006. Retrofitting America's Diesel Engines: A Guide to Cleaner Air Through Cleaner Diesel, 11Frederick, MD: Diesel Technology Forum.