@book{110183,
	author = {Khandker, Shahidur R. and Koolwal, Gayatri B. and ebrary, Inc.},
	title = {Handbook on impact evaluation},
	publisher = {World Bank,},
	year = {2010.},
	address = {Washington, DC :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10369843}
}