@book{210023,
	author = {Besterfield, Dale H. and O'Hagan, Robert E.},
	title = {Technical sketching with an introduction to 2D and 3D CAD},
	publisher = {Pearson Prentice Hall},
	year = {c2007.},
	address = {Upper Saddle River, N.J.},
	edition = {4th ed.},
	note = {Includes index.}
}