Purdue University. Agricultural Experiment Station. (1957). Research bulletin. [Agricultural Experiment Station, Purdue University].
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPurdue University. Agricultural Experiment Station. Research Bulletin. West Lafayette, Ind.: [Agricultural Experiment Station, Purdue University], 1957.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPurdue University. Agricultural Experiment Station. Research Bulletin. [Agricultural Experiment Station, Purdue University], 1957.
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