Não informado. (1931). Dairy situation. U.S. Department of Agriculture, Economic Research Service.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Dairy Situation. Washington: U.S. Department of Agriculture, Economic Research Service, 1931.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Dairy Situation. U.S. Department of Agriculture, Economic Research Service, 1931.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.