@book{26751,
	author = {Ball, W. W. Rouse},
	title = {Mathematical recreations and essays /},
	publisher = {Macmillan ,},
	year = {1939 .},
	address = {London :},
	edition = {11th ed.},
	url = {http://catalog.hathitrust.org/api/volumes/oclc/9602508.html}
}