Não informado. (2002). ACOG educational bulletin. American College of Obstetricians and Gynecologists.
Chicagoスタイル(17版)引用形式Não informado. ACOG Educational Bulletin. Washington: American College of Obstetricians and Gynecologists, 2002.
MLA(8版)引用形式Não informado. ACOG Educational Bulletin. American College of Obstetricians and Gynecologists, 2002.
警告: この引用は必ずしも正確ではありません.