@book{229345,
	author = {Eco, Umberto. and ebrary, Inc.},
	title = {On the medieval theory of signs},
	publisher = {J. Benjamins,},
	year = {1989.},
	series = {Foundations of semiotics,},
	address = {Amsterdam ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10459005}
}