Johnson, N. (1989). AutoCAD: The complete reference. Osborne McGraw-Hill.
Dyfyniad Arddull ChicagoJohnson, Nelson. AutoCAD: The Complete Reference. Berkeley, Calif: Osborne McGraw-Hill, 1989.
Dyfyniad MLAJohnson, Nelson. AutoCAD: The Complete Reference. Osborne McGraw-Hill, 1989.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.