Ford, E. S., Mannino, D. M., Giles, W. H., Wheaton, A. G., Liu, Y., & Croft, J. B. (2014). Prescription Practices for Chronic Obstructive Pulmonary Disease: Findings from the National Ambulatory Medical Care Survey 1999–2010. COPD.

Ford, Earl S., David M. Mannino, Wayne H. Giles, Anne G. Wheaton, Yong Liu, and Janet B. Croft. "Prescription Practices for Chronic Obstructive Pulmonary Disease: Findings From the National Ambulatory Medical Care Survey 1999–2010." COPD 2014.

Ford, Earl S., et al. "Prescription Practices for Chronic Obstructive Pulmonary Disease: Findings From the National Ambulatory Medical Care Survey 1999–2010." COPD 2014.