@book{56607,
	author = {Nolt, John Eric. and Rohatyn, Dennis A. and ebrary, Inc.},
	title = {Schaum's outline of theory and problems of logic},
	publisher = {McGraw-Hill,},
	year = {1998.},
	series = {Schaum's outline series},
	address = {New York :},
	edition = {2nd ed.},
	url = {http://site.ebrary.com/lib/strathmore/Doc?id=5004534}
}