1. Bohn H. McNeal B. and O'Connor G. (1985). Soil Chemistry. 2 nd Ed. John Wiley and Sons Inc. New York.
2. BS 1377 (1990). Methods of Tests for Soils for Civil Engineering Purposes. British Standards Institutions London.
3. 2785 (GSP 199) © 2010 ASCE
4. Gidigasu M. D. (1976). Laterite Soil Engineering: Pedogenesis and Engineering Principles. Elsevier Amsterdam.
5. Calcium and Sodium Bentonite for Hydraulic Containment Applications