@book{195234,
	author = {Roberts, Don D. and Aid to Scholarly Publications Programme.},
	title = {The existential graphs of Charles S. Peirce},
	publisher = {Mouton,},
	year = {1973.},
	series = {Approaches to semiotics ;},
	address = {The Hague :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10373497}
}