@book{4149,
	author = {Bates, Regis J.},
	title = {Voice and Data Communications Handbook},
	publisher = {McGraw Hill},
	year = {2007},
	address = {India},
	url = {https://libgen.is/book/index.php?md5=C82A2B06F4AD421B13D8AC67CF149704}
}