Ashley, M. J., Cohen, J., Bull, S., Ferrence, R., Poland, B., Pederson, L., & Gao, J. (2000). Knowledge About Tobacco and Attitudes Toward Tobacco Control: How Different are Smokers and Nonsmokers? Can J Public Health.

Ashley, Mary Jane, Joanna Cohen, Shelley Bull, Roberta Ferrence, Blake Poland, Linda Pederson, a Joseph Gao. "Knowledge About Tobacco and Attitudes Toward Tobacco Control: How Different Are Smokers and Nonsmokers?" Can J Public Health 2000.

Ashley, Mary Jane, et al. "Knowledge About Tobacco and Attitudes Toward Tobacco Control: How Different Are Smokers and Nonsmokers?" Can J Public Health 2000.