Hough, Mike and Warburton, Hamish and Few, Bradley and May, Tiggey and Man, Lan-Ho and Witten, John and Turnbull, Paul J (2003) A growing market: the domestic cultivation of cannabis. JRF drug and alcohol research programme York: Joseph Rowntree Foundation .

May, Tiggey and Duffy, Martin and Hough, Mike and Few, Bradley (2006) Understanding drug selling in communities: insider or outsider trading? York: Joseph Rowntree Foundation.