American Association of State Highway and Transportation Officials, & American Association of State Highway and Transportation Officials. (2012). Standard specifications for transportation materials and methods of sampling and testing (32. edition.). Washington, D.C.: American Association of State Highway and Transportation Officials.
Chicago Style CitationAmerican Association of State Highway and Transportation Officials, and American Association of State Highway and Transportation Officials. Standard Specifications for Transportation Materials and Methods of Sampling and Testing. 32. edition. Washington, D.C.: American Association of State Highway and Transportation Officials, 2012.
MLA CitationAmerican Association of State Highway and Transportation Officials, and American Association of State Highway and Transportation Officials. Standard Specifications for Transportation Materials and Methods of Sampling and Testing. 32. edition. Washington, D.C.: American Association of State Highway and Transportation Officials, 2012.