@book{529281,
	author = {Das, Braja M.,},
	title = {Principles of foundation engineering /},
	publisher = {Cengage Learning,},
	year = {2007.},
	address = {Australia :},
	edition = {6th ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy1104/2006904569-b.html}
}