@book{1218433,
	author = {HACKWORTH,J.R./HACKWORTH,F.D. and HACKWORTH,J.R./HACKWORTH,F.D.},
	title = {PROGRAMMABLE LOGIC CONTROLLERS PROGRAMMING METHODS AND APPLICATIONS},
	publisher = {PEARSON INDIA EDUCATION SERVICE PVT LTD UTTAR PRADESH},
	year = {2006}
}