Não informado. (2012). Purdue Agriculture Reports. Purdue University, Agricultural Experiment Station.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Purdue Agriculture Reports. West Lafayette, Ind: Purdue University, Agricultural Experiment Station, 2012.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Purdue Agriculture Reports. Purdue University, Agricultural Experiment Station, 2012.
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