@book{6583,
	author = {Valkenburg, Mac E. Van.},
	title = {Network analysis /},
	publisher = {Prentice Hall College Div,},
	year = {1997.},
	address = {[S.l.] :},
	edition = {3rd ed.},
	url = {http://www.amazon.com/exec/obidos/ASIN/0136110959/chopaconline-20}
}