1. Word drug report 2014;United Nations Office of Drugs and Crime,2014
2. Barrett D Hunt N Stoicescu C Harm Reduction International Injecting drug use among under 18s: a snapshot of available data [Internet] http://www.ihra.net/files/2014/08/06/injecting_among_under_18s_snapshot_WEB.pdf
3. Joint United Nations Programme on HIV/AIDS Unpublished estimates; 2013
4. Youth drug-use research and the missing pieces in the puzzle: how can researchers support the next generation of harm reduction approaches;Cook,2011
5. HIV seroprevalence in street youth, St Petersburg, Russia;Kissin;AIDS,2007