1. AASHTO Highway Subcommittee on Construction, 2003. Major Types of Transportation Construction Specifications. A Guideline to Understanding Their Evolution and Application. Report of the Quality Construction Task Force. American Association of State Highway and Transportation Officials, Washington D.C., August 2003.
2. AASHTO M145, 2008. Standard Specification for Classification of Soils and Soil-Aggregate Mixtures for Highway Construction Purposes. American Association of State and Highway Transportation Officials.
3. AASHTO T180, 2010. Standard Method of Test for Moisture-Density Relations of Soils Using a 4.54-kg (10-lb) Rammer and a 457-mm (18-in.) Drop. American Association of State and Highway Transportation Officials.
4. AASHTO T-193, 2010. Standard Method of Test for the California Bearing Ratio. American Association of State and Highway Transportation Officials.
5. AASHTO T-307, 2007. Standard Method of Test for Determining the Resilient Modulus of Soils and Aggregate Materials. American Association of State and Highway Transportation Officials.