American public opinion: Its origins, content and impact. Erikson RS, Tedin KL. RS Erikson, KL Tedin - 2015 - books.google.com GSID: ibJyxB6jYSMJ
Civic engagement and the transition to adulthood. Flanagan C, Levine P. C Flanagan, P Levine - The future of children, 2010 - JSTOR GSID: DISATbBuxKIJ