Quelle:Frazier, Stacy L./Mehta, Tara G./Atkins, Marc S./Hur, Kwan/Rusch, Dana (2012): Not Just a Walk in the Park: Efficacy to Effectiveness for After School Programs in Communities of Concentrated Urban Poverty. Adm Policy Ment Health. 40:406-418, DOI: 10.1007/s10488-012-0432-x