@book{43671,
	author = {Azar, Jamal J and Samuel, G. Robello.},
	title = {Drilling engineering /},
	publisher = {PennWell Corp.,},
	year = {c2007.},
	address = {Tulsa, Okla. :},
	url = {http://www.loc.gov/catdir/toc/ecip073/2006034984.html}
}