1. Al-Refeai, T. (1991). Behavior of granular soils reinforced with discrete randomly oriented inclusions. Geotextiles and Geomembranes, 10(4), 319–333.
2. ASTM D854-10 Standard test methods for specific gravity of soil solids by water pycnometer. American Society for Testing of Materials Pennsylvania PA USA.
3. ASTM D3080M-11 Standard test method for direct shear test of soils under consolidated drained conditions. American Society for Testing of Materials Pennsylvania PA USA.
4. ASTM D3967-08 Standard test method for splitting tensile strength of intact rock core specimens. American Society for Testing of Materials Pennsylvania PA USA.
5. ASTM D5084-03 Standard test methods for falling head permeability test of soils. American Society for Testing of Materials Pennsylvania PA USA.