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Knappett, J. and Craig, R.F. (2012) Craig’s soil mechanics. 8th ed. London: Spon. Available at: http://lib.myilibrary.com/browse/open.asp?id=352526&entityid=https://idp.brunel.ac.uk/entity.
Minnick, R. (1995) The surveying handbook: [Volume I]. Second edition. Edited by R.C. Brinker. Dordrecht, Netherlands: Springer Science+Business Media, B.V.
Smithson, P., Addison, K. and Atkinson, K. (2008) Fundamentals of the physical environment. 4th edn. London: Routledge. Available at: http://lib.myilibrary.com/browse/open.asp?id=460015&entityid=https://idp.brunel.ac.uk/entity.
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Waltham, T. (2009) Foundations of engineering geology. 3rd ed. Abingdon, UK: Spon Press.