@book{1457,
	author = {Sergiovanni, Thomas J. and Starratt, Robert J.},
	title = {Supervision :a redefinition. /},
	publisher = {McGraw-Hill,},
	year = {c2002.},
	address = {Boston :},
	edition = {7th ed.},
	url = {http://www.loc.gov/catdir/toc/mh031/2001037022.html}
}