Bureau of applied economics and statistics. (1980). Statistical handbook. Bureau of applied economics and statistics.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBureau of applied economics and statistics. Statistical Handbook. Bureau of applied economics and statistics, 1980.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBureau of applied economics and statistics. Statistical Handbook. Bureau of applied economics and statistics, 1980.
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