1. ASTM D1557, 2012. Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Modified Effort (56,000 ft-lbf/ft3 (2700 kN-m/m3)). ASTM International, West Conshohocken, PA 2007.
2. ASTM D422-63(2007)e2, 2007. Standard Test Method for Particle-Size Analysis of Soils. ASTM International, West Conshohocken, PA 2007.
3. ASTM D854, 2014. Standard Test Methods for Specific Gravity of Soil Solids by Water Pycnometer. ASTM Internatinal, West Conshohocken, PA 2014.
4. Soil mechanics in pavement engineering;Brown;Géotechnique,1996
5. A comparison of railway track foundation design methods;Burrow;Proc. Inst. Mech. Eng., Part F: J. Rail Rapid Transit,2007