Παραπομπή σε μορφή APA (7η εκδ.)

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].

Παραπομπή σε μορφή Chicago (17η εκδ.)

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.

Παραπομπή σε μορφή MLA (9th εκδ.)

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.