1. Standard Specifications for Highway Bridges,2002
2. American Society for Testing and Materials (ASTM). Standard Test Method for Determining the Shear Strength of Soil-Geosynthetic and Geosynthetic-Geosynthetic Interfaces by Direct Shear. ASTM D2216–10.
3. American Society for Testing and Materials (ASTM). Standard Test Methods for Laboratory Determination of Water (Moisture) Content of Soil and Rock by Mass. ASTM D854–14.
4. American Society for Testing and Materials (ASTM). Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils. ASTM D4318–10.
5. American Society for Testing and Materials (ASTM). Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Modified Effort (56,000 Ft-Lbf/ft3 (2,700 kN-M/m3)). ASTM D1557–12.