Book  (Apr 1999)  Page(s) 564.  
 
Schneeball (Wichurana) Christoph Weigand 1906.

Book  (1936)  Page(s) 651.  
 
Schneeball (hybrid wichurana) Weigand 1905; snow-white, medium-size, semi-double, gillyflower-form, dense clusters of 15-50, fragrance 5/10, very long stems, growth 7/10. Sangerhausen

Book  (1933)  Page(s) 215.  
 
SCHNEEBALL. C. Weigand, 1906. Wichuraiana with clusters of medium-sized, double, snow-white flowers.

Website/Catalog  (1914)  Page(s) 7.  
 
Hybrid wichuranas. Schneeball. Medium size, snow-white, in trusses.

Book  (1913)  Page(s) 15.  
 
The Wichuraiana Roses: A Selection of Varieties
(The approximate date of flowering of each variety is given.)
Schneeball. — One of the best white varieties, bearing snow-white flowers in large clusters. July 10.

Magazine  (5 Aug 1911)  Page(s) 374.  
 
The Parentage of Roses.
The following list of the world's Roses and their parentage has been compiled by Mr. Robert Daniel, 38 Russell Road. Fishponds, Bristol, and by his kind permission we are enabled to publish it...
Schneeball... Hybrid Wichuraiana, Weigand, 1906, Chance seedling R. wichuraiana

Book  (1911)  Page(s) 69.  
 
The Wichuraiana Hybrids.
The following list includes most of the best Wichuraiana Roses to date (1910):
Schneeball. — A beautiful pure white Rose, with verydouble rosette-like flowers borne in large trusses, which do not all open at once. It flowers from mid-June.