1. American Society for Testing Materials (ASTM) D-4253 (2006) Standard test methods for maximum index density and unit weight of soils using a vibratory table. ASTM International, USA
2. American Society for Testing Materials (ASTM) D-4254 (2006) Standard test methods for minimum index density and unit weight of soils and calculation of relative density. ASTM International, USA
3. American Society for Testing Materials (ASTM) D-422 (2007) Standard test method for particle-size analysis of soils. ASTM International, USA
4. American Society for Testing Materials (ASTM) D-7382 (2008) Standard test methods for determination of maximum dry unit weight and water content range for effective compaction of granular soils using a vibrating hammer. ASTM International, USA
5. American Society for Testing Materials (ASTM) D-854 (2014) Standard test methods for specific gravity of soil solids by water pycnometer. ASTM International, USA