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2. Hefer Arno and Scllion Tom. "Materials Specifications and Construction Techniques for Heavy-Duty Flexible Bases: Literature Review and Status Report on Experimental Section." Report 4358-1. Texas Department of Transportation. September 2002.
3. Novel Approach for Characterization of Unbound Materials
4. Sebesta S. Harris P. & Liu W. 2008. "Improving Lab Compaction Methods for Roadway Base Materials". Texas Department of Transportation and Federal Highway Administration FHWA/TX-07/0-5135-2.
5. Tao M. Abu-Farsakh. M. Y. 2008 "Effect of Drainage in Unbound Aggregate Bases on Flexible Pavement Performance " FHWA Louisiana Transportation Research Center FHWA Washington D. C. FHWA/LA.07/429.