@book{33662,
	author = {Smith, Alan L.,},
	title = {Youth physical activity and sedentary behavior :},
	publisher = {Human Kinetics,},
	year = {c2008.},
	address = {Champaign, IL :},
	url = {http://www.loc.gov/catdir/toc/ecip0812/2008009922.html}
}