@book{1960,
	author = {Duncan, J. M. and Wright, Stephen G.},
	title = {Soil strength and slope stability /},
	publisher = {John Wiley & Sons,},
	year = {2005.},
	address = {Hoboken, N.J. :},
	url = {http://www.loc.gov/catdir/toc/ecip0422/2004019535.html}
}