Não informado. (1920). Agricultural Engineering. American Society of Agricultural Engineers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Agricultural Engineering. St. Joseph, Mich: American Society of Agricultural Engineers, 1920.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Agricultural Engineering. American Society of Agricultural Engineers, 1920.
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