@book{23,
	author = {Beall, Christine /},
	title = {Masonry design and detailing /},
	publisher = {McGraw-Hill,},
	year = {c1997.},
	series = {Construcción},
	address = {New York :},
	edition = {4th ed.},
	note = {Incluye índice analítico },
	url = {http://www.loc.gov/catdir/description/mh022/97001066.html}
}