@book{130886,
	author = {Hofstadter, Douglas R.,},
	title = {Gödel, Escher, Bach :},
	publisher = {Penguin Books},
	year = {c1979.},
	address = {New York :},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/enhancements/fy0830/78019943-d.html}
}