1. Angell, H. R. 1929. Purple blotch of onion (Macrosporium porri Ell.) Jour. Agr. Res.38: 467–487.
2. Carpenter, J. P. 1942. Moldy core of apples in Wisconsin. Phytopath.32: 896–900.
3. Chevallier, F. F. 1826. Flore générale des environs de Paris.1:32.
4. Cook, M. T. andG. W. Martin. 1913. The Jonathan spot rot. Phytopath3: 119–122.
5. —. 1914. The Jonathan spot rot. Phytopath.4: 102–105.