Não informado. (1919). Journal of Farm Economics. American Farm Economic Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Journal of Farm Economics. Menasha, Wis: American Farm Economic Association, 1919.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Journal of Farm Economics. American Farm Economic Association, 1919.
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