United Nations. Dept. of Economic and Social Affairs. International directory of organizations concerned with the aging. United Nations.
芝加哥风格引文United Nations. Dept. of Economic and Social Affairs. International Directory of Organizations Concerned with the Aging. New York,: United Nations.
MLA引文United Nations. Dept. of Economic and Social Affairs. International Directory of Organizations Concerned with the Aging. United Nations.
警告：这些引文格式不一定是100％准确.