Book  (Apr 1993)  Page(s) 652.  
 
Zulu Queen Hybrid Tea, dark maroon, 1939, ('Cathrine Kordes' x 'E.G. Hill') x 'Fritz Hoger'; Kordes. Description.

Book  (1990)  Page(s) 87.  Includes photo(s).
 
Zulu Queen Hybrid Tea. Kordes 1939... Parentage: 'Catherine Kordes' x 'E.G. Hill'... double, deep wine-red blooms...

Book  (1947)  Page(s) 261.  
 
Zulu Queen (H.T.) has large, double, pointed flowers of deep crimson-maroon, borne upon vigorous, erect and branching plants with deep green foliage. Kordes 1939....June-September.

Book  (1943)  Page(s) 263.  
 
A Glossary of Roses
Zulu Queen (Hybrid Tea) has large double pointed flowers of deep crimson-maroon, borne upon vigorous, erect and branching plants with deep green foliage.
Kordes 1939. Deciduous, Vigorous Growth... Purpose: Bedding, Garden; Months of flowering: June-September. 

Book  (1939)  Page(s) 77.  
 
R. Marion Hatton.  An American Review of the New Roses.
His H.T., Zulu Queen, produced some very dark fowers of blackish maroon, changing to scarlet at the base, while other blooms were crimson. It is very double and has an overpowering fragrance, too strong at times to be pleasant. I shall need to see more of this Rose before wanting it.