Não informado. (1917). The Plant Disease Bulletin. Department of Agriculture, Division of Mycology and Disease Survey.
Citação do estilo Chicago (17ª ed.)Não informado. The Plant Disease Bulletin. Washington: Department of Agriculture, Division of Mycology and Disease Survey, 1917.
Citação MLA (8ª ed.)Não informado. The Plant Disease Bulletin. Department of Agriculture, Division of Mycology and Disease Survey, 1917.
Atenció: Aquestes cites poden no estar 100% correctes.