@book{1507,
	author = {Sipser, Michael.},
	title = {Introduction to the theory of computation /},
	publisher = {PWS Pub,},
	year = {c1997.},
	address = {Boston:},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/enhancements/fy1514/96035322-b.html}
}