@book{124044,
	author = {Pilkey, Orrin H., and Pilkey-Jarvis, Linda. and ebrary, Inc.},
	title = {Useless arithmetic},
	publisher = {Columbia University Press,},
	year = {c2007.},
	address = {New York :},
	url = {http://site.ebrary.com/lib/strathmore/Doc?id=10183515}
}