@book{64473,
	author = {Jeffery, Harley M.},
	title = {Loop checking :},
	publisher = {ISA-The Instrumentation, Systems, and Automation Society,},
	year = {2005},
	series = {ISA technician series},
	address = {Research Triangle Park, NC :},
	url = {http://www.loc.gov/catdir/toc/ecip057/2005001679.html}
}