Brown, Katherine M.; Robert D. Keppel; Joseph G. Weis; Marvin E. Skeen (May 2006). "CASE MANAGEMENT for Missing Children Homicide Investigation"(PDF). National Criminal Justice Service (Office of Juvenile Justice and Delinquency Prevention, U.S. Department of Justice). p. 13. Archived from the original(PDF) on 21 October 2007. Retrieved 4 June 2009.
Brown, Katherine M.; Robert D. Keppel; Joseph G. Weis; Marvin E. Skeen (May 2006). "CASE MANAGEMENT for Missing Children Homicide Investigation"(PDF). National Criminal Justice Service (Office of Juvenile Justice and Delinquency Prevention, U.S. Department of Justice). p. 13. Archived from the original(PDF) on 21 October 2007. Retrieved 4 June 2009.