1. UNICEF: United nations children’s fund. www.unicef-irc.org/portfolios/crc-optional-2.html/ (2000)
2. United nations office on drugs and crime. www.unodc.org/unodc/data-and-analysis
3. National crime information center. www.fbi.gov/services/cjis/ncic
4. Missing children statistics. globalmissingkids.org/awareness/missing-children-statistics/
5. Face recognition system. https://timesofindia.indiatimes.com/city/delhi/delhi-facial-recognition-system