Não informado. (2000). Agricultural Science Digest. Indiana Agricultural Experiment Station.
Chicago-referens (17:e uppl.)Não informado. Agricultural Science Digest. Lafayette, Ind: Indiana Agricultural Experiment Station, 2000.
MLA-referens (8:e uppl.)Não informado. Agricultural Science Digest. Indiana Agricultural Experiment Station, 2000.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.