United Nations Population Fund. UNFPA state of world population, 2007: Unleashing the potential of urban growth.
芝加哥风格引文United Nations Population Fund. UNFPA State of World Population, 2007: Unleashing the Potential of Urban Growth.
MLA引文United Nations Population Fund. UNFPA State of World Population, 2007: Unleashing the Potential of Urban Growth.
警告：这些引文格式不一定是100％准确.