@book{2112,
	title = {Programmable logic controllers, third edition- by frank D. petruzella.},
	publisher = {TATA McGraw Hill Edition,},
	year = {2010.},
	address = {[S.l.] :},
	edition = {Third edition.},
	url = {http://www.amazon.com/exec/obidos/ASIN/B007YTDCV4/chopaconline-20}
}