Não informado. (2000). Research and Farming. North Carolina Agricultural Experiment Station.
Chicago-referens (17:e uppl.)Não informado. Research and Farming. Raleigh, NC: North Carolina Agricultural Experiment Station, 2000.
MLA-referens (8:e uppl.)Não informado. Research and Farming. North Carolina Agricultural Experiment Station, 2000.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.