Não informado. (1976). Quick bibliography series. National Agricultural Library, Department of Agriculture.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Quick Bibliography Series. Beltsville, Md: National Agricultural Library, Department of Agriculture, 1976.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Quick Bibliography Series. National Agricultural Library, Department of Agriculture, 1976.
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