Book  (1947)  Page(s) 81.  
 
Mr. A. Lee, South Auckland, N. Z. 
Oswald Sieper, good, but balls in wet weather. 

Book  (1947)  Page(s) 213.  
 
Oswald Sieper (H.T.) has exceptionally large very double flowers of high-pointed shape, with large stiff petals of creamy-white tinted lemon at the centre, borne upon long strong stems. Growth is vigorous, erect and branching, foliage green and glossy and not subject to disease. Krause 1932...Moderately fragrant...June-Sept. Hardy.

Book  (1944)  Page(s) 71.  
 
Terry Honeybun, Victoria
Oswald Sieper: Very large exhibition shape. Growth and foliage very clean and vigorous. Very free blooming. An easy Rose to grow

Book  (1943)  Page(s) 58.  
 
Frank Mason, NZ
Oswald Sieper was doing particularly well; this is a fine Rose when it becomes established. 

Book  (1942)  Page(s) 58.  
 
G. W. Cole, Parramatta, NSW
Oswald Siepier (big show Rose, a bit too loose and overbloomed at times, but a beauty when good),

Book  (1938)  Page(s) 130.  
 
From New Zealand
Oswald Sieper (1935).—White, with sulphur centre, large full flowers, good growth; exhibition.

Website/Catalog  (1938)  Page(s) 35.  
 
Bush Roses
Oswald Sieper (Hybrid Tea)... Beautiful white with sulphur yellow centre, possessing ideal form, stiff large petals, large, full flowers carried on strong erect stems. Strong, bushy growth and disease-resisting foliage. We have a high opinion of this Rose. Recommended. Introduced 1933.

Book  (1937)  Page(s) 76.  
 
Harry H. Hazlewood.  Some Better Roses 1930-1936
Oswald Sieper (E): Long buds, opening to semi-double to double blooms of high standard. More for exhibitors than general garden use.

Website/Catalog  (1937)  Page(s) 121.  Includes photo(s).
 
Oswald Sieper
Same photo: 1938, p. 123; 1939, p. 120

Book  (1936)  Page(s) 68.  
 
Frank Mason. Roses in New Zealand. 
Oswald Sieper is a white or ivory white; I have not decided which yet, but it is a beautiful Rose that has stood the heavy, inclement weather of the spring, and is still going strong;