Cita APA (7a ed.)

Ekström, M. P., Jogréus, C., & Ström, K. E. (2012). Comorbidity and sex-related differences in mortality in oxygen-dependent chronic obstructive pulmonary disease. Public Library of Science (PLoS).

Cita Chicago Style (17a ed.)

Ekström, Magnus P., Claes Jogréus, y Kerstin E. Ström. Comorbidity and Sex-related Differences in Mortality in Oxygen-dependent Chronic Obstructive Pulmonary Disease. Public Library of Science (PLoS), 2012.

Cita MLA (8a ed.)

Ekström, Magnus P., et al. Comorbidity and Sex-related Differences in Mortality in Oxygen-dependent Chronic Obstructive Pulmonary Disease. Public Library of Science (PLoS), 2012.