Não informado. (1919). Plant Disease Reporter. Agricultural Research Service.
Chicago-Zitierstil (17. Ausg.)Não informado. Plant Disease Reporter. Washington: Agricultural Research Service, 1919.
MLA-Zitierstil (8. Ausg.)Não informado. Plant Disease Reporter. Agricultural Research Service, 1919.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.