United Nations. Department of International Economic and Social Affairs. (1990). Patterns of first marriage: Timing and prevalence. United Nations.
芝加哥风格引文United Nations. Department of International Economic and Social Affairs. Patterns of First Marriage: Timing and Prevalence. New York: United Nations, 1990.
MLA引文United Nations. Department of International Economic and Social Affairs. Patterns of First Marriage: Timing and Prevalence. United Nations, 1990.
警告：这些引文格式不一定是100％准确.