Não informado. (1940). Labor market and employment security. Bureau of Employment Security.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Labor Market and Employment Security. Washington: Bureau of Employment Security, 1940.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Labor Market and Employment Security. Bureau of Employment Security, 1940.
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