Book  (1936)  Page(s) 233.  
 
Einhard, Rudolf (HP) Welter & Hinner 1899; Eugen Fürst X Duke of Teck; bright velvety red, large, double, lasting, long stems, growth 6/10, bushy. Sangerhausen

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...
Rudolph Einhardt... Hybrid Perpetual, Welter, 1898, Eugène Fürst X Duke of Teck

Magazine  (1901)  Page(s) 15.  
 
Rudolf Einhard (Welter & Hinner). Crossing of Eugen Fürst X Duke of Teck, is recommended as a beautiful velvety, brilliant red rose.

Book  (1899)  Page(s) 183.  
 
Rud. Einhard, HR, Welter, 1899, rouge velouté luisant