American Association of State Highway and Transportation Officials, & American Association of State Highway and Transportation Officials. (1950). Standard specifications for highway materials and methods of sampling and testing (6. edition.). Washington: National Press Building.
Chicago Style CitationAmerican Association of State Highway and Transportation Officials, and American Association of State Highway and Transportation Officials. Standard Specifications for Highway Materials and Methods of Sampling and Testing. 6. edition. Washington: National Press Building, 1950.
MLA CitationAmerican Association of State Highway and Transportation Officials, and American Association of State Highway and Transportation Officials. Standard Specifications for Highway Materials and Methods of Sampling and Testing. 6. edition. Washington: National Press Building, 1950.