National Planning Association. (1965). The economies of fifteen metropolitan areas: A historical and projected employment output, population and personal income 1950, 1957, 1960, 1962 and 1975. [National Planning Association].
芝加哥风格引文National Planning Association. The Economies of Fifteen Metropolitan Areas: A Historical and Projected Employment Output, Population and Personal Income 1950, 1957, 1960, 1962 and 1975. Washington, D.C: [National Planning Association], 1965.
MLA引文National Planning Association. The Economies of Fifteen Metropolitan Areas: A Historical and Projected Employment Output, Population and Personal Income 1950, 1957, 1960, 1962 and 1975. [National Planning Association], 1965.
警告：这些引文格式不一定是100％准确.