@book{19106,
	author = {Birren, James E.},
	title = {Encyclopedia of gerontology /},
	publisher = {Academic Press,},
	year = {c2007.},
	address = {Amsterdam ;},
	edition = {2nd ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy0702/2006935560-d.html}
}