United States. Bureau of Labor Statistics. (1963). Employment and earnings statistics for the United States 1909-62: Based on the 1957 standrd industrial classification. Govt. Pr..
Lua i Stíl Chicago (17ú heag.)United States. Bureau of Labor Statistics. Employment and Earnings Statistics for the United States 1909-62: Based on the 1957 Standrd Industrial Classification. Wash.: Govt. Pr., 1963.
Lua MLA (8ú heag.)United States. Bureau of Labor Statistics. Employment and Earnings Statistics for the United States 1909-62: Based on the 1957 Standrd Industrial Classification. Govt. Pr., 1963.
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