Não informado. (2020). Progress Report. Pennsylvania State University, Agricultural Experiment Station.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Progress Report. University Park, Pa: Pennsylvania State University, Agricultural Experiment Station, 2020.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Progress Report. Pennsylvania State University, Agricultural Experiment Station, 2020.
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