Não informado. (1939). Feed situation. U.S. Department of Agriculture, Bureau of Agricultural Economics.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Feed Situation. Washington: U.S. Department of Agriculture, Bureau of Agricultural Economics, 1939.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Feed Situation. U.S. Department of Agriculture, Bureau of Agricultural Economics, 1939.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.