United States. Bureau of the Census. Population Division. (1978). World population, 1977: Recent demographic estimates for the countries and regions of the world. U. S. Government Printing Office.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUnited States. Bureau of the Census. Population Division. World Population, 1977: Recent Demographic Estimates for the Countries and Regions of the World. Washington: U. S. Government Printing Office, 1978.
एमएलए (9वां संस्करण) प्रशस्ति पत्रUnited States. Bureau of the Census. Population Division. World Population, 1977: Recent Demographic Estimates for the Countries and Regions of the World. U. S. Government Printing Office, 1978.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.