@book{2664,
	author = {Rosen, Kenneth H. and Krithivasan, Kamala },
	title = {Discrete mathematics & its applications with combinatorics and graph theory /},
	publisher = {McGraw-Hill Education,},
	year = {c2011 (2017 printing).},
	address = {Chennai:},
	edition = {- 7th ed. -}
}