National Research Council (U.S.). Highway Research Board, National Research Council (U.S.). Highway Research Board. Meeting, & National Research Council (U.S.). Special Committee on International Cooperative Activities. (1972). Soils and bases : characteristics, classification, and planning: 16 reports prepared for the 51st Annual Meeting. Highway Research Board.
Chicago-referens (17:e uppl.)National Research Council (U.S.). Highway Research Board, National Research Council (U.S.). Highway Research Board. Meeting, och National Research Council (U.S.). Special Committee on International Cooperative Activities. Soils and Bases : Characteristics, Classification, and Planning: 16 Reports Prepared for the 51st Annual Meeting. Washington: Highway Research Board, 1972.
MLA-referens (9:e uppl.)National Research Council (U.S.). Highway Research Board, et al. Soils and Bases : Characteristics, Classification, and Planning: 16 Reports Prepared for the 51st Annual Meeting. Highway Research Board, 1972.