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1."Heroin Century", Tom Carnwath, Ian Smith; Routledge, 2002 page 8

2. Heroin Century Book by Tom Carnwath, Ian Smith; Routledge, 2002 page 15

3.Heroin Century Book by Tom Carnwath, Ian Smith; Routledge, 2002 page 16

4. "Opium: A History" Martin H. Levinson; ETC.: A Review of General Semantics, Vol. 55, 1998

5. "A Hundred-Year Habit" by Ian Scott; History Today, Vol. 48, June 1998

6. RESEARCH NOTE - PRESCRIBING DIAMORPHINE FOR MEDICAL CONDITIONS: A VERY BRITISH PRACTICE Journal of Drug Issues April 1, 2004 Gossop, Michael; Keaney