Não informado. (2002). ACOG educational bulletin. American College of Obstetricians and Gynecologists.
Citação do estilo Chicago (17ª ed.)Não informado. ACOG Educational Bulletin. Washington: American College of Obstetricians and Gynecologists, 2002.
Citação MLA (8ª ed.)Não informado. ACOG Educational Bulletin. American College of Obstetricians and Gynecologists, 2002.
警告：這些引文格式不一定是100％准確.