Norwitz, E., & Schorge, J. (2008). At a Glance. Obstetri & Ginekologi. Erlangga.
Lua i Stíl Chicago (17ú heag.)Norwitz, Errol, agus John Schorge. At a Glance. Obstetri & Ginekologi. Erlangga, 2008.
Lua MLA (9ú heag.)Norwitz, Errol, agus John Schorge. At a Glance. Obstetri & Ginekologi. Erlangga, 2008.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.