White, William and Mojer-Torres, Lisa (2010) Recovery oriented methadone maintenance. Chicago: Great Lakes Addiction Technology Transfer Center, the Philadelphia Department of Behavioral.

Best, David and Rome, Andrew and Hanning, Kirstie A and White, William and Gossop, Michael and Taylor, Avril and Perkins, Andy (2010) Research for recovery: a review of the drugs evidence base. Edinburgh: Scottish Government Social Research.