Παραπομπή APA

(1964). Metropolitan area industry employment and population estimates, 1950, 1957, 1960, 1962. Washington, D.C: National Planning Association.

Παραπομπή Chicago Style

Metropolitan Area Industry Employment and Population Estimates, 1950, 1957, 1960, 1962. Washington, D.C: National Planning Association, 1964.

Παραπομπή MLA

Metropolitan Area Industry Employment and Population Estimates, 1950, 1957, 1960, 1962. Washington, D.C: National Planning Association, 1964.

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