Não informado. World population year bulletin. World Federation of United Nations Associations.
Chicagoスタイル(17版)引用形式Não informado. World Population Year Bulletin. Geneva, Suíça: World Federation of United Nations Associations.
MLA(8版)引用形式Não informado. World Population Year Bulletin. World Federation of United Nations Associations.
警告: この引用は必ずしも正確ではありません.