Laniado-Laborín R. 2009. Smoking and chronic obstructive pulmonary disease (COPD). Parallel epidemics of the 21 century. International Journal of Environmental Research and Public Health. 6 (1): 209–24. doi:10.3390/ijerph6010209. PMC 2672326. PMID 19440278.
Decramer M; Janssens W. & Miravitlles M. 2012. Chronic obstructive pulmonary disease. Lancet379 (9823): 1341–51. doi:10.1016/S0140-6736(11)60968-9. PMID 22314182.
Murray C.J. et al 2012. Disability-adjusted life years (DALYs) for 291 diseases and injuries in 21 regions, 1990–2010: a systematic analysis for the Global Burden of Disease Study 2010. Lancet380 (9859): 2197–223. doi:10.1016/S0140-6736(12)61689-4. PMID 23245608.