@book{183076,
	author = {Head, George O; Pietra, Charles A; Segal, Kenneth J L.},
	title = {Autocad 3D book: covers through autocad release 13 for dos and windows.},
	publisher = {Galgotia Publications Pvt Ltd},
	year = {1996},
	address = {New Delhi},
	edition = {1}
}