HICKS, M. A. Risk and variability in geotechnical engineering. Edtion ed. London: Thomas Telford, 2007. 225 p. p. ISBN 9780727734860 .
PHOON, K.-K. AND J. CHING. Risk and reliability in geotechnical engineering [online]. 1st. [Boca Raton]: CRC Press,, 2015.