Norwitz, E., & Schorge, J. (2008). At a Glance. Obstetri & Ginekologi. Erlangga.
Cita Chicago (17th ed.)Norwitz, Errol, i John Schorge. At a Glance. Obstetri & Ginekologi. Erlangga, 2008.
Cita MLA (9th ed.)Norwitz, Errol, i John Schorge. At a Glance. Obstetri & Ginekologi. Erlangga, 2008.
Atenció: Aquestes cites poden no estar 100% correctes.