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.
Citación estilo ChicagoAmerican Association of State Highway and Transportation Officials, y 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.
Cita MLAAmerican Association of State Highway and Transportation Officials, y 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.