@book{6679,
	author = {Bolton, W.},
	title = {Programmable logic controllers :},
	publisher = {Newnes,},
	year = {2003.},
	address = {Oxford ;},
	edition = {3rd ed.},
	note = {Previous ed.: 2000.},
	url = {http://www.loc.gov/catdir/toc/fy0606/2005281817.html}
}