Chartrand, G. and Lesniak, L. Graphs and digraphs - 4th - Boca Raton Chapman & Hall/CRC Press 2005 - viii, 386p. Bibl. Index. "Purchased under NBHM grant for the year 2004-2005" ISBN: 1584883901 Dewey Class. No.: 511.5 / C486.GD