Craig, R.F. and Craig, R.F. (2004) Craig’s soil mechanics. 7th ed. London: Spon Press. Available at: http://Bangor.eblib.com/patron/FullRecord.aspx?p=1449548.
Lunne, T., Robertson, P.K. and Powell, J.J.M. (2002) Cone penetration testing in geotechnical practice. London: Spon Press.
Vickers, B. (1983) Laboratory work in soil mechanics. 2nd ed. London: Granada.
Whitlow, R. (2001) Basic soil mechanics. 4th ed. Harlow: Prentice Hall.