@book{153571,
	author = {Henle, Michael. and ebrary, Inc.},
	title = {Which numbers are real?},
	publisher = {Mathematical Association of America,},
	year = {c2012.},
	series = {Classroom resource materials},
	address = {Washington, D.C. :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10722438}
}