Hopkins, W. S. (1936). Seasonal unemployment in the state of Washington. University of Washington.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHopkins, William Stephen. Seasonal Unemployment in the State of Washington. Seattle: University of Washington, 1936.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHopkins, William Stephen. Seasonal Unemployment in the State of Washington. University of Washington, 1936.
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