APA (7th ed.) Citation

Focus Medica & Barnes, P. J. (2007). Chronic obstructive pulmonary disease [computer file]: An overview. Focus Medica.

Chicago Style (17th ed.) Citation

Focus Medica and Peter J. Barnes. Chronic Obstructive Pulmonary Disease [computer File]: An Overview. Singapore: Focus Medica, 2007.

MLA (9th ed.) Citation

Focus Medica and Peter J. Barnes. Chronic Obstructive Pulmonary Disease [computer File]: An Overview. Focus Medica, 2007.