@book{223398,
	author = {Azar, Jamal J., and Samuel, G. Robello. and ebrary, Inc.},
	title = {Drilling engineering},
	publisher = {PennWell Corp.,},
	year = {c2007.},
	address = {Tulsa, Okla. :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10201495}
}