(2001). Levels and trends of contraceptive use as assessed in 1998. United Nations.
Chicagoスタイル(17版)引用形式Levels and Trends of Contraceptive Use as Assessed in 1998. New York: United Nations, 2001.
MLA(9版)引用形式Levels and Trends of Contraceptive Use as Assessed in 1998. United Nations, 2001.
警告: この引用は必ずしも正確ではありません.