1. Shear strength of a soil containing vegetation roots;Ali;Soils Found.,2008
2. Classification of soils and control procedures used in construction of embankments;Allen;Public Roads,1942
3. Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System);ASTM D 2487,2006
4. Standard Test Method for Particle - Size Analysis of Soils;ASTM D 422,2007
5. Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils;ASTM D 4318,2010