参考文献

Ananova
Aram Halle-Rizla
CNN
Coen Springelkamp - Haarlems Dagblad
Haarlems Dagblad
Jeremy Laurance Health Editor - The Independent
Los Angeles Times
Malcolm Dean - The Guardian
Malou Lindholm- Radio NederIand WereIdomroep
Manchester Even?ng News
Marc Emey - Cannabis Culture
Mark Orwoll -Travel & Leisure
Michka - Maintenant
Nick Hopkins - The Guardian
Paul Gallagher - Express on Sunday
Pete Brady - Cannabis Culture
Stockport Express
The Associated Press - Manchester, England
The BBC
The Guardian
The Lindesmith Center
Magda Aelvoet
The Parool
The TeIegraaf
UKCIA
Zwolse Courant