Nations, U. (1976). World statistics in brief. The author.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNations, United. World Statistics in Brief. The author, 1976.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNations, United. World Statistics in Brief. The author, 1976.
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