@book{57700,
	author = {Chartrand, Gary and Lesniak, Linda},
	title = {Graphs & digraphs /},
	publisher = {CRC Press & Taylor and Francis,},
	year = {2016.},
	series = {Textbooks in mathematics},
	address = {Boca Raton :},
	edition = {6th ed.},
	note = {Include index.}
}