Reference
Gaines, L. & Miller, RL ( 2006). Strafferet i aktion: (. 3. udgave) Kernen. Belmont, Californien: Thomson /Wadsworth. ISBN:. 0-495-00305-4
National Drug Intelligence Center. (2003). Arkansas Drug trusselsvurdering.
Hentet marts 2009 fra United States Department of Justice: https://www.usdoj.gov/ndic/pubs6/6184/6184p.pdf