@book{62567,
	author = {Wuthnow, Robert. and ebrary, Inc.},
	title = {Poor Richard's principle},
	publisher = {Princeton University Press,},
	year = {c1996.},
	address = {Princeton, N.J. :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10031967}
}