@book{139993,
	author = {Winkler, P. and ebrary, Inc.},
	title = {Mathematical puzzles},
	publisher = {AK Peters,},
	year = {2004.},
	address = {Natick, Mass. :},
	note = {Includes index.},
	url = {http://site.ebrary.com/lib/strathmore/Doc?id=10159707}
}