@book{5119,
	author = {Shay, William A},
	title = {Understanding data communications and networks},
	publisher = {BS PUblications},
	year = {2019},
	address = {Hyderabad},
	edition = {3rd ed.},
	note = {4495 24/01/2022 PBA22/499 02/02/2022 UIET (SFS)}
}