Kevin M. Beaver, Chris L. Gibson, Michael G. Turner, Matt DeLisi, Michael G. Vaughn, and Ashleigh Holand Crime & Delinquency http://cad.sagepub.com/content/57/6/907.short 2009 Date Tue, 06/10/2014 - 03:41 PM Research Types ADD Health Delinquency Environmental Factors Genetic Influence Kevin M. Beaver Peers Twins