Cita APA

Ford, E. S., Croft, J. B., Mannino, D. M., Wheaton, A. G., Zhang, X., & Giles, W. H. (2013). COPD Surveillance—United States, 1999-2011. American College of Chest Physicians.

Chicago Style Citation

Ford, Earl S., Janet B. Croft, David M. Mannino, Anne G. Wheaton, Xingyou Zhang, i Wayne H. Giles. COPD Surveillance—United States, 1999-2011. American College of Chest Physicians, 2013.

Cita MLA

Ford, Earl S., et al. COPD Surveillance—United States, 1999-2011. American College of Chest Physicians, 2013.