1. American Society for Testing and materials (2011) Annual Book of ASTM Standards, vol. 4.08. Designation: D 3080/D 3080M- 11, Standard Test Method for Direct Shear Test of Soils Under Consolidated Drained Conditions, vol. 4.08. Annual Book of ASTM Standards
2. ASTM D854-02 (2014) Standard test methods for specific gravity of soil solids by water pycnometer 1. ASTM Standard Guide, vol 4, pp 1–8
3. ASTM D1997–13 (2013) Standard test method for laboratory determination of the fiber content of peat samples by dry mass. ASTM International, West Conshohocken
4. ASTM D2794 (2007) Standard test methods for moisture, ash, and organic matter of peat and other organic soils. ASTM International, West Conshohocken
5. ASTM D6528–07 (2007) Consolidated undrained direct simple shear testing of cohesive soils. STM International, West Conshohocken, pp 1–9