1. American Society for Testing and Materials. (2007). ASTM D1883 Standard Test Method for CBR (California Bearing Ratio) of Laboratory-Compacted Soils.
2. American Society for Testing and Materials. (2008). ASTM C618 Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete.
3. American Society for Testing and Materials. (2009). ASTM D1557 Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Modified Effort (56,000 ft-lbf/ft3(2,700 kN-m/m3)).
4. American Society for Testing and Materials. (2010). ASTM D2487 Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System).
5. American Society for Testing and Materials. (2010). ASTM D4318 Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils.