Παραπομπή APA

(1978). World population 1977: Recent demographic estimates for the countries and regions of the world. Washington: Government Printing Office.

Παραπομπή Chicago Style

World Population 1977: Recent Demographic Estimates for the Countries and Regions of the World. Washington: Government Printing Office, 1978.

Παραπομπή MLA

World Population 1977: Recent Demographic Estimates for the Countries and Regions of the World. Washington: Government Printing Office, 1978.

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