Não informado. (1917). The Plant Disease Bulletin. Department of Agriculture, Division of Mycology and Disease Survey.
Chicago-referens (17:e uppl.)Não informado. The Plant Disease Bulletin. Washington: Department of Agriculture, Division of Mycology and Disease Survey, 1917.
MLA-referens (8:e uppl.)Não informado. The Plant Disease Bulletin. Department of Agriculture, Division of Mycology and Disease Survey, 1917.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.