@book{22208,
	author = {Mazur, David R.},
	title = {Combinatorics :},
	publisher = {Mathematical Association of America,},
	year = {2009.},
	series = {Maa textbooks},
	address = {Washington, DC :},
	edition = {1st ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy1005/2009937059-t.html}
}