Não informado. (1919). Plant Disease Reporter. Agricultural Research Service.
Chicago-referens (17:e uppl.)Não informado. Plant Disease Reporter. Washington: Agricultural Research Service, 1919.
MLA-referens (8:e uppl.)Não informado. Plant Disease Reporter. Agricultural Research Service, 1919.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.