@book{1971,
	author = {Schofield, W. and Breach, M.},
	title = {Engineering surveying /},
	publisher = {Elsevier/Butterworth-Heinemann,},
	year = {2007.},
	address = {Amsterdam ;},
	edition = {6th ed.},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/enhancements/fy0729/2006933363-d.html}
}