(1957). Background facts on world population and population trends. United Nations.
Chicagoスタイル(17版)引用形式Background Facts on World Population and Population Trends. New York: United Nations, 1957.
MLA(9版)引用形式Background Facts on World Population and Population Trends. United Nations, 1957.
警告: この引用は必ずしも正確ではありません.