(1921). Circular. Extension Service, College of Agriculture, University of Arkansas : U.S. Department of Agriculture, cooperating.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCircular. Little Rock, Arkansas: Extension Service, College of Agriculture, University of Arkansas : U.S. Department of Agriculture, cooperating, 1921.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCircular. Extension Service, College of Agriculture, University of Arkansas : U.S. Department of Agriculture, cooperating, 1921.
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