World Health Organization. (1999). Reduction of maternal mortality. World health Organization.
Chicagoスタイル(17版)引用形式World Health Organization. Reduction of Maternal Mortality. Geneva: World health Organization, 1999.
MLA(8版)引用形式World Health Organization. Reduction of Maternal Mortality. World health Organization, 1999.
警告: この引用は必ずしも正確ではありません.