Cita APA (7a ed.)

Oakley, A., & Houd, S. (2013). Helpers in childbirth: Midwifery today. Routledge.

Cita Chicago Style (17a ed.)

Oakley, Ann., y Susanne Houd. Helpers in Childbirth: Midwifery Today. London ; New York: Routledge, 2013.

Cita MLA (9a ed.)

Oakley, Ann., y Susanne Houd. Helpers in Childbirth: Midwifery Today. Routledge, 2013.