Zakaria , Z. A. (2001). Obstetric anal sphincter injury: Retrospective review of risk factors.
Cita Chicago (17th ed.)Zakaria , Zahar Azuar. Obstetric Anal Sphincter Injury: Retrospective Review of Risk Factors. 2001.
Cita MLA (9th ed.)Zakaria , Zahar Azuar. Obstetric Anal Sphincter Injury: Retrospective Review of Risk Factors. 2001.
Atenció: Aquestes cites poden no estar 100% correctes.