THL: Finland Drug Situation 2009: New developments, trends and in-depth information on selected issues, s. 135–136. (Report 45/2009) National Institute for Health and Welfare, European Monitoring Centre for Drugs and Drug Addiction, 2009. ISBN 978-952-245-210-8Teoksen verkkoversio (PDF). (englanniksi) (Arkistoitu – Internet Archive)
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THL: Finland Drug Situation 2009: New developments, trends and in-depth information on selected issues, s. 135–136. (Report 45/2009) National Institute for Health and Welfare, European Monitoring Centre for Drugs and Drug Addiction, 2009. ISBN 978-952-245-210-8Teoksen verkkoversio (PDF). (englanniksi) (Arkistoitu – Internet Archive)