Gray, K. M., Carpenter, M. J., Lewis, A. L., Klintworth, E. M., & Upadhyaya, H. P. (2012). Varenicline versus Bupropion XL for Smoking Cessation in Older Adolescents: A Randomized, Double-Blind Pilot Trial. Oxford University Press.

Gray, Kevin M., Matthew J. Carpenter, A. Lee Lewis, Erin M. Klintworth, und Himanshu P. Upadhyaya. Varenicline Versus Bupropion XL for Smoking Cessation in Older Adolescents: A Randomized, Double-Blind Pilot Trial. Oxford University Press, 2012.

Gray, Kevin M., et al. Varenicline Versus Bupropion XL for Smoking Cessation in Older Adolescents: A Randomized, Double-Blind Pilot Trial. Oxford University Press, 2012.