1. Chen F.H., Foundation on Expansive Soils, Development in Geotechnical Engineering, Elsevier Scientific Publishing Company, New York, USA, 463 (1988).
2. Wilson C.R., Davis J.G. and Mejia N., Landscaping on Expansive Soils, www.ext.colostate.Edu, (2001)
3. Yoder E.J., and Witczak M.W., Principles of Pavement Design, 2nd Edition, John Wiley & Sons, Inc., USA, 699 (1975).
4. Muntohar A.S., Regional Seminar at Islamic University of Indonesia Sept. 4th, Yogyakarta, Indonesia, HYPERLINK (1999).