@book{224048,
	author = {Powell, Guy R. and Groves, Steven. and ebrary, Inc.},
	title = {ROI of $ocial media},
	publisher = {John Wiley & Sons (Asia),},
	year = {c2011.},
	address = {Singapore :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10484749}
}