@book{50,
	author = {Samuelson, Paul A. and  Nordhaus, William D.},
	title = {Economics/ },
	publisher = {Tata McGraw Hill,},
	year = {c2010},
	address = {New Delhi :},
	edition = {19th Edn.},
	url = {http://192.168.9.22:8050/get/pdf/0198776187.Oxford.University.Press.USA.The.Foundations.of.Modern.Macroeconomics.May.2002%20-%20Unknown_6633.pdf}
}