Cita APA (7a ed.)

Halpern, S. H., & Douglas, M. J. (2005). Evidence-based obstetric anesthesia. BMJ Books : Blackwell Pub.

Cita Chicago Style (17a ed.)

Halpern, Stephen H., y M. Joanne Douglas. Evidence-based Obstetric Anesthesia. Malden, Mass.: BMJ Books : Blackwell Pub, 2005.

Cita MLA (9a ed.)

Halpern, Stephen H., y M. Joanne Douglas. Evidence-based Obstetric Anesthesia. BMJ Books : Blackwell Pub, 2005.