Harber, P., Tashkin, D. P., Simmons, M., Crawford, L., Hnizdo, E., & Connett, J. (2007). Effect of Occupational Exposures on Decline of Lung Function in Early Chronic Obstructive Pulmonary Disease. American Thoracic Society.

Harber, Philip, Donald P. Tashkin, Michael Simmons, Lori Crawford, Eva Hnizdo, und John Connett. Effect of Occupational Exposures On Decline of Lung Function in Early Chronic Obstructive Pulmonary Disease. American Thoracic Society, 2007.

Harber, Philip, et al. Effect of Occupational Exposures On Decline of Lung Function in Early Chronic Obstructive Pulmonary Disease. American Thoracic Society, 2007.