Hawton, K., Bergen, H., Simkin, S., Brock, A., Griffiths, C., Romeri, E., . . . Gunnell, D. (2009). Effect of withdrawal of co-proxamol on prescribing and deaths from drug poisoning in England and Wales: Time series analysis. BMJ Publishing Group Ltd.

Hawton, Keith, Helen Bergen, Sue Simkin, Anita Brock, Clare Griffiths, Ester Romeri, Karen L. Smith, Navneet Kapur, ja David Gunnell. Effect of Withdrawal of Co-proxamol On Prescribing and Deaths From Drug Poisoning in England and Wales: Time Series Analysis. BMJ Publishing Group Ltd, 2009.

Hawton, Keith, et al. Effect of Withdrawal of Co-proxamol On Prescribing and Deaths From Drug Poisoning in England and Wales: Time Series Analysis. BMJ Publishing Group Ltd, 2009.