@book{66779,
	author = {Venn, John,},
	title = {Symbolic logic /},
	publisher = {Chelsea Pub. Co.,},
	year = {1971 [reprint 1984]},
	address = {Bronx, N.Y :},
	edition = {2d ed., rev. and rewritten.},
	note = {Reprint of the 1894 ed.}
}