@book{37457,
	author = {Sawyer, W. W. and ebrary, Inc.},
	title = {What is calculus about?},
	publisher = {Mathematical Association of America,},
	year = {c1962.},
	address = {Washington, D.C. :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10729359}
}