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Coleman, Tim, Jim Thornton, John Britton, Sarah Lewis, Kim Watts, Michael WH Coughtrie, Clare Mannion, Neil Marlow, and Christine Godfrey. Protocol for the Smoking, Nicotine and Pregnancy (SNAP) Trial: Double-blind, Placebo-randomised, Controlled Trial of Nicotine Replacement Therapy in Pregnancy. BioMed Central, 2007.

Coleman, Tim, et al. Protocol for the Smoking, Nicotine and Pregnancy (SNAP) Trial: Double-blind, Placebo-randomised, Controlled Trial of Nicotine Replacement Therapy in Pregnancy. BioMed Central, 2007.