APA citiranje

Putcha, N., Drummond, M. B., Connett, J. E., Scanlon, P. D., Tashkin, D. P., Hansel, N. N., & Wise, R. A. (2013). Chronic Productive Cough is Associated with Death in Smokers with Early COPD. COPD.

Citação norma Chicago

Putcha, Nirupama, M. Bradley Drummond, John E. Connett, Paul D. Scanlon, Donald P. Tashkin, Nadia N. Hansel, and Robert A. Wise. "Chronic Productive Cough Is Associated With Death in Smokers With Early COPD." COPD 2013.

MLA citiranje

Putcha, Nirupama, et al. "Chronic Productive Cough Is Associated With Death in Smokers With Early COPD." COPD 2013.