@book{61215,
	author = {Leach, James A. and Bledsaw, Thomas D.},
	title = {AutoCAD 2012 instructor :},
	publisher = {McGraw-Hill,},
	year = {c2012},
	series = {The McGraw-Hill graphics series},
	address = {New York, NY :},
	edition = {7th ed.},
	note = {Includes index}
}