Book  (1936)  Page(s) 748.  
 
Warden, William (HP) Mitchell 1880; sport of Clém. Joigneaux; carmine, shaded light pink, very large, double, floriferous, repeats, growth 7/10.

Magazine  (19 Aug 1911)  Page(s) 404.  
 
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...
William Warden... Hybrid Perpetual, Mitchell, 1880, Sport Clemence Joigneaux

Book  (1910)  Page(s) 295.  
 
William Warden Hybrid Perpetual... a light sport from Madame Clemence Joigneaux, producing pink flowers of fine shape; forces well.

Magazine  (9 Jun 1900)  Page(s) 415.  
 
Mildew-proof Roses.
It must be admitted that attacks of this troublesome fungus are, more or less, influenced by temperature and culture, but yet there are some few kinds that resist the disease, no matter how changeable the weather or how erratic the culture. [...] Madame Clemence Joigneaux is another kind that rarely takes the mildew, and in like manner its sports, William Warden and Margaret Haywood (which, by the way, seem to be identical) are almost entirely free from it.

Book  (1899)  Page(s) 180.  
 
William Warden, HR, Mitchell, 1880, carmin nuancé

Website/Catalog  (1894)  Page(s) 181.  
 
Hybrid Perpetual Roses. 
William Warden A light sport from Madame Clemence Joignerux, producing pink flowers of a fine shape. 

Magazine  (1887)  Page(s) 145.  
 
William Warden (Mitchell, 1879). pure pink, a light sport from Mme. Clémence Joigneaux; fine foliage; forces well.

Book  (1882)  Page(s) 37.  
 
William Warden... Hybride Perpétuel. Mitchell. 1879 Rose tendre. Fleur grande. Plante vigoureuse.