Não informado. (2001). Annual Report. North Carolina State College of Agriculture and Engineering, Agricultural Extension Service.
Lua i Stíl Chicago (17ú heag.)Não informado. Annual Report. Raleigh, NC: North Carolina State College of Agriculture and Engineering, Agricultural Extension Service, 2001.
Lua MLA (8ú heag.)Não informado. Annual Report. North Carolina State College of Agriculture and Engineering, Agricultural Extension Service, 2001.
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