UNITED NATIONS DEV.PROGRAMMS. (1971). HUMAN FERTILITYN AND NATIONAL DEVELOPMENT. UNITED NATIONS.
芝加哥风格引文UNITED NATIONS DEV.PROGRAMMS. HUMAN FERTILITYN AND NATIONAL DEVELOPMENT. NEW YORK: UNITED NATIONS, 1971.
MLA引文UNITED NATIONS DEV.PROGRAMMS. HUMAN FERTILITYN AND NATIONAL DEVELOPMENT. UNITED NATIONS, 1971.
警告：这些引文格式不一定是100％准确.