Não informado. (1972). Abortion Surveillance. Center for Disease Control.
Chicagoスタイル(17版)引用形式Não informado. Abortion Surveillance. Atlanta, Ga: Center for Disease Control, 1972.
MLA(8版)引用形式Não informado. Abortion Surveillance. Center for Disease Control, 1972.
警告: この引用は必ずしも正確ではありません.