1. American Coal Ash Association, 2003. Fly Ash Facts for Highway Engineers, FHWA-IF-03-019. US Department of Transportation, Federal Highway Administration, Washington, D.C., USA.
2. American Coal Ash Association, 2004. Coal Combustion Product (CCP) Production and Use Survey. Retrieved April 4, 2006 from http://www.acaa-usa.org/PDF/2004_CCP_Survey(9-9-05).pdf.
3. Probabilistic modeling of one dimensional water movement and leaching from highway embankments containing secondary materials;Apul;Environmental Engineering Science,2005
4. ASTSWMO, 2000. ASTSWMO Beneficial Use Survey. Association of State and Territorial Solid Waste Management Officials, Washington, D.C.
5. Edil, T., Benson. C., Senol, A., Bin-Shafique, M., Tanyu, B., Kim, W., 2002. Field Evaluation of Construction Alternatives for Roadway Over Soft Sub-grade. Wisconsin Department of Transportation Project for Monitoring and Analysis of Leaching from Sub-bases Constructed with Industrial Byproducts, Interim Report, March 1, 2002. Wisconsin Department of Transportation, Madison, Wisconsin, USA.