@book{30082,
	author = {Stebbing, L. Susan and Mundle, C. W. K.},
	title = {A modern elementary logic /},
	publisher = {Methuen,},
	year = {1961 [reprinted 1969]},
	address = {London :},
	edition = {5th ed.},
	note = {"A textbook primarily intended for the use of first-year students reading logic for a university examination."--Pref.}
}