@book{51959,
	author = {Rehg, James A. and Sartori, Glenn J.},
	title = {Programmable logic controllers /},
	publisher = {Pearson Prentice Hall,},
	year = {c2009},
	address = {Upper Saddle River, N.J. :},
	edition = {2nd ed.},
	url = {http://www.loc.gov/catdir/toc/ecip0820/2008025785.html}
}