Não informado. (1972). Journal of agronomic education. American Society of Agronomy.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Journal of Agronomic Education. Madison, Wis: American Society of Agronomy, 1972.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Journal of Agronomic Education. American Society of Agronomy, 1972.
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