Não informado. Agricultural reviews and manuals. Agricultural Research Service.
Chicago-viite (17. p.)Não informado. Agricultural Reviews and Manuals. New Orleans, La: Agricultural Research Service.
MLA-viite (8. p.)Não informado. Agricultural Reviews and Manuals. Agricultural Research Service.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.