@book{1869,
	author = {Billstein, Rick. and Libeskind, Shlomo.},
	title = {A problem solving approach to mathematics /},
	publisher = {Pearson,},
	year = {2009.},
	address = {Upper Saddle River, NJ :},
	edition = {10th ed.},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/toc/ecip0828/2008039978.html}
}