@book{68638,
	author = {Quine, W. V. and ebrary, Inc.},
	title = {Mathematical logic},
	publisher = {Harvard University Press,},
	year = {c1981.},
	address = {Cambridge, MA :},
	edition = {Rev. ed.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10331337}
}