@book{132984,
	author = {Luthans, Fred. and Youssef, Carolyn M. and ebrary, Inc.},
	title = {Psychological capital},
	publisher = {Oxford University Press,},
	year = {2007.},
	address = {Oxford ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10160506}
}