Citação norma APA

Barnes, P. J. (2007). Chronic Obstructive Pulmonary Disease: A Growing but Neglected Global Epidemic. Public Library of Science.

Citação norma Chicago

Barnes, Peter J. Chronic Obstructive Pulmonary Disease: A Growing but Neglected Global Epidemic. Public Library of Science, 2007.

Citação norma MLA

Barnes, Peter J. Chronic Obstructive Pulmonary Disease: A Growing but Neglected Global Epidemic. Public Library of Science, 2007.

Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.