1. ASTM D5778 (2000) Standard Test Method for Electronic Friction Cone and Piezocone Penetration Testing of Soils. ASTM International, West Conshohocken
2. ASTM D2216 (2010a) Standard test methods for laboratory determination of water (moisture) content of soil and rock by mass. ASTM International, West Conshohocken
3. ASTM D4318 (2010b) Standard test methods for liquid limit, plastic limit, and plasticity index of soils. ASTM International, West Conshohocken
4. ASTM D7503 (2010c) Standard test method for measuring the exchange complex and cation exchange capacity of inorganic fine-grained soils. ASTM International, West Conshohocken
5. ASTM D4813 (2014) Standard test methods for specific gravity of soil solids by water pycnometer. ASTM International, West Conshohocken