@book{43223,
	author = {Balakrishnan, V K .},
	title = {Combinatorics including concept of Graph Theory /},
	publisher = {McGraw - Hill book company ,},
	year = {2008.},
	series = {Schaum`s Outline Series,},
	address = {New York :},
	edition = {Tata McGraw-Hill ed /}
}