@book{50939,
	author = {Williams, Andrew R.},
	title = {Spon's practical guide to alterations and extensions /},
	publisher = {Taylor & Francis,},
	year = {2008},
	address = {New York, NY :},
	edition = {2nd ed.},
	url = {http://www.loc.gov/catdir/toc/ecip0724/2007031731.html}
}