@book{183677,
	author = {Bellamy, John,},
	title = {Digital telephony /},
	publisher = {Wiley,},
	year = {c1991.},
	address = {New York :},
	edition = {2nd ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy0607/90037906-d.html}
}