Não informado. (2000). Research and Farming. North Carolina Agricultural Experiment Station.
Lua i Stíl Chicago (17ú heag.)Não informado. Research and Farming. Raleigh, NC: North Carolina Agricultural Experiment Station, 2000.
Lua MLA (8ú heag.)Não informado. Research and Farming. North Carolina Agricultural Experiment Station, 2000.
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