@book{1687,
	author = {Hurley, Patrick J.},
	title = {A concise introduction to logic / Patrick J.Hurley.},
	publisher = {Belmont, Calif. : Wadsworth Pub. Co., c1994.},
	address = {Belmont, Calif. : Wadsworth Pub. Co., c1994.},
	edition = {5th ed.}
}