Não informado. (2002). ACOG technical bulletin. American College of Obstetricians and Gynecologists.
Cita Chicago Style (17a ed.)Não informado. ACOG Technical Bulletin. Washington: American College of Obstetricians and Gynecologists, 2002.
Cita MLA (8a ed.)Não informado. ACOG Technical Bulletin. American College of Obstetricians and Gynecologists, 2002.
Precaución: Estas citas no son 100% exactas.