1. ASTM D4318-10e1 (2010) Standard test methods for liquid limit, plastic limit, and plasticity index of soils. ASTM International, West Conshohocken
2. ASTM D2487-11 (2011) Standard practice for classification of soils for engineering purposes (unified soil classification system). ASTM International, West Conshohocken
3. ASTM D2216-10 (2010) Standard test methods for laboratory determination of water (moisture) content of soil and rock by mass. ASTM International, West Conshohocken
4. ASTM D854-14 (2014) Standard test methods for specific gravity of soil solids by water pycnometer. ASTM International, West Conshohocken, www.astm.org
5. ASTM D698-12e2 (2012) Standard test methods for laboratory compaction characteristics of soil using standard effort (12400 ft-lbf/ft3 (600 kN-m/m3)). ASTM International, West Conshohocken