1.
Declining rates of physical activity in the United States: what are the contributors?
by Brownson, Ross C
Annual review of public health, 2005, Vol.26 (1), p.421-443

2.
Preventing Childhood Obesity through State Policy: Qualitative Assessment of Enablers and Barriers
by Dodson, Elizabeth A
Journal of public health policy, 2009, Vol.30 (S1), p.S161-S176
