National Research Council (U.S.). Highway Research Board & National Research Council (U.S.). Highway Research Board. (1949). Engineering use of agricultural soil maps: The use of agricultural soil maps and the status of agricultural soil mapping in the United States. Highway Research Board, Division of Engineering and Industrial Research, National Research Council.
Chicago Style (17. basım) AtıfNational Research Council (U.S.). Highway Research Board ve National Research Council (U.S.). Highway Research Board. Engineering Use of Agricultural Soil Maps: The Use of Agricultural Soil Maps and the Status of Agricultural Soil Mapping in the United States. Washington, D.C: Highway Research Board, Division of Engineering and Industrial Research, National Research Council, 1949.
MLA (9th ed.) AtıfNational Research Council (U.S.). Highway Research Board ve National Research Council (U.S.). Highway Research Board. Engineering Use of Agricultural Soil Maps: The Use of Agricultural Soil Maps and the Status of Agricultural Soil Mapping in the United States. Highway Research Board, Division of Engineering and Industrial Research, National Research Council, 1949.