@book{18558,
	author = {|aJohnsonbaugh, Richard,|d1941-},
	title = {|aDiscrete mathematics /|cRichard Johnsonbaugh.},
	publisher = {|aUpper Saddle River, NJ :|bPearson/Prentice Hall,|cc2009.},
	edition = {|a7th ed.}
}