1. Applied Technology Council (ATC). (1996). Improved seismic design criteria for California bridges: Provisional recommendations.
2. ASTM D 1140 "Standard Test Method for Amount of Material in Soils Finer Than the No. 200 (75-μm) Sieve" American Society for Testing and Materials West Conshohocken Pennsylvania USA.
3. ASTM D 1557 "Standard Test Method for Laboratory Compaction Characteristics of Soil Using Modified Effort" American Society for Testing and Materials West Conshohocken Pennsylvania USA.
4. ASTM D 2419 "Standard Test Method for Soils for Sand Equivalent Value of Soils and Fine Aggregate" American Society for Testing and Materials West Conshohocken Pennsylvania USA. ASTM D 2487 "Standard Classification of Soils for Engineering Purposes (Unified Soil Classification System" American Society for Testing and Materials West Conshohocken Pennsylvania USA.
5. ASTM D 4318 "Standard Test Method for Liquid Limit Plastic Limit and Plasticity Index of Soils" American Society for Testing and Materials West Conshohocken Pennsylvania USA.