1. ASTM Standard D 698-07. (2011). "Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort (12 400 ft-lbf/ft 3 (600 kN-m/m 3 ))." Annual Book of ASTM Standards Vol. 04.08 ASTM International West Conshohocken PA 2011.
2. ASTM Standard D 1556-07. (2011). "Standard Test Method for Density and Unit Weight of Soil in Place by the Sand-Cone Method." Annual Book of ASTM Standards Vol. 04.08 ASTM International West Conshohocken PA 2011.
3. ASTM Standard D 2487-10. (2011). "Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System)." Annual Book of ASTM Standards Vol. 04.08 ASTM International West Conshohocken PA 2011.
4. ASTM Standard D 2937-10. (2011). "Test Method for Density of Soil in Place by the Drive-Cylinder Method." Annual Book of ASTM Standards Vol. 04.08 ASTM International West Conshohocken PA 2011.
5. ASTM Standard D 6938-10. (2011). "Standard Test Method for In-Place Density and Water Content of Soil and Soil-Aggregate by Nuclear Methods (Shallow Depth)." Annual Book of ASTM Standards Vol. 04.09 ASTM International West Conshohocken PA 2011.