"Hotline 116 000". Missing Children Europe. Archived from the original on 7 February 2021. Retrieved 9 March 2022.
ncjrs.gov
Brown, Katherine M.; Keppel, Robert D.; Weis, Joseph G.; Skeen, Marvin E. (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.
"Hotline 116 000". Missing Children Europe. Archived from the original on 7 February 2021. Retrieved 9 March 2022.
Brown, Katherine M.; Keppel, Robert D.; Weis, Joseph G.; Skeen, Marvin E. (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.