Não informado. (2000). Agricultural Science Digest. Indiana Agricultural Experiment Station.
Chicago-viite (17. p.)Não informado. Agricultural Science Digest. Lafayette, Ind: Indiana Agricultural Experiment Station, 2000.
MLA-viite (8. p.)Não informado. Agricultural Science Digest. Indiana Agricultural Experiment Station, 2000.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.