@book{219655,
	author = {Marzano, Robert J. and Frontier, Tony. and ebrary, Inc.},
	title = {Effective supervision},
	publisher = {ASCD,},
	year = {c2011.},
	address = {Alexandria, Va. :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10471835}
}