Hughes, J. R., Solomon, L. J., Fingar, J. R., Helzer, J. E., & Callas, P. W. (2012). The Natural History of Efforts to Stop Smoking: A Prospective Cohort Study.
استشهاد بنمط شيكاغوHughes, John R., Laura J. Solomon, James R. Fingar, John E. Helzer, و Peter W. Callas. The Natural History of Efforts to Stop Smoking: A Prospective Cohort Study. 2012.
MLA استشهادHughes, John R., et al. The Natural History of Efforts to Stop Smoking: A Prospective Cohort Study. 2012.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.