1. ASTM (2011) Standard practice for classification of soils for engineering purposes (unified soil classification system). ASTM D2487. ASTM, West Conshohocken
2. ASTM (2011) Standard Test Method for Particle-Size Analysis of Soils. ASTM D422. ASTM, West Conshohocken
3. ASTM (2011) Standard test methods for specific gravity of soil solids by water pycnometer. ASTM D854. ASTM, West Conshohocken
4. ASTM (2011) Standard test methods for maximum index density and unit weight of soils using a vibratory table. ASTM D4253. ASTM, West Conshohocken
5. ASTM (2011) Standard test methods for minimum index density and unit weight of soils and calculation of relative density. ASTM D4254. ASTM, West Conshohocken