@book{126850,
	author = {Kirkpatrick, Donald L. and Kirkpatrick, James D., and ebrary, Inc.},
	title = {Implementing the four levels},
	publisher = {Berrett-Koehler Publishers,},
	year = {c2007.},
	address = {San Francisco :},
	edition = {1st ed.},
	url = {http://site.ebrary.com/lib/strathmore/Doc?id=10205948}
}