@book{1519,
	author = {Weeks, John Robert.},
	title = {Population :},
	publisher = {Wadsworth Publishing,},
	year = {c1999.},
	address = {Belmont, CA :},
	edition = {7th ed.},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/enhancements/fy1515/98039201-b.html}
}