1. AASHTO T180 (2001) Modified method of test for the moisture-density relations of soils. Washington, DC
2. ANSI/IEEE Std 81 (1983) The Institute of Electrical and Electronics Engineers. New York
3. ASTM D 1557-12 (2012) Standard test methods for laboratory compaction characteristics of soil using modified effort. West Conshohocken
4. ASTM D4643-08 (2008) Standard test method for determination of water (moisture) content of soil by microwave oven heating. ASTM International, West Conshohocken
5. Bowles JE (1988) Foundation analysis and design, 4th edn. McGraw-Hill, New York