Beard, E., Brown, J., McNeill, A., Michie, S., & West, R. (2015). Has growth in electronic cigarette use by smokers been responsible for the decline in use of licensed nicotine products? Findings from repeated cross-sectional surveys. Thorax.

Beard, Emma, Jamie Brown, Ann McNeill, Susan Michie, und Robert West. "Has Growth in Electronic Cigarette Use By Smokers Been Responsible for the Decline in Use of Licensed Nicotine Products? Findings From Repeated Cross-sectional Surveys." Thorax 2015.

Beard, Emma, et al. "Has Growth in Electronic Cigarette Use By Smokers Been Responsible for the Decline in Use of Licensed Nicotine Products? Findings From Repeated Cross-sectional Surveys." Thorax 2015.