@book{38744,
	author = {Singh, R P and Sapre, S D},
	title = {Communication systems Analog & Digital /},
	publisher = {Tata McGraw Hill  ,},
	year = {c2007 [2009, 2010 reprint].},
	address = {New Delhi :},
	edition = {2nd ed.},
	note = {Includes Index.}
}