Cita APA (7th ed.)

Kayem, G., Kurinczuk, J., Lewis, G., Golightly, S., Brocklehurst, P., & Knight, M. (2011). Risk factors for progression from severe maternal morbidity to death: A national cohort study. Public Library of Science.

Cita Chicago (17th ed.)

Kayem, G., J. Kurinczuk, G. Lewis, S. Golightly, P. Brocklehurst, i M. Knight. Risk Factors for Progression from Severe Maternal Morbidity to Death: A National Cohort Study. Public Library of Science, 2011.

Cita MLA (9th ed.)

Kayem, G., et al. Risk Factors for Progression from Severe Maternal Morbidity to Death: A National Cohort Study. Public Library of Science, 2011.