@book{170563,
	author = {Gerson, Richard F. and ebrary, Inc.},
	title = {Writing and implementing a marketing plan},
	publisher = {Crisp,},
	year = {c1991.},
	address = {Los Altos, Calif. :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10058855}
}