Book  (Apr 1999)  Page(s) 406.  
 
Gustav Sobry Hybrid Tea. Welter 1902. Parentage: 'Kaiserin Auguste Viktoria' x 'Comte Chandon'. The author cites information from different sources... golden yellow and red...

Book  (Jun 1992)  Page(s) 64.  
 
Gustav Sobry (Hybrid Tea, Welter, 1902, yellow) mentioned in the listing for 'Comte Chandon'.

Book  (1936)  Page(s) 670.  
 
Sobry, Gustav (HT) Welter 1902; K. Aug. Viktoria X Comte Chandon; reddish golden-yellow, fades to light yellow, large, double, fragrance 6/10, floriferous, repeats, upright stems, robust branches, growth 7/10.

Website/Catalog  (1914)  Page(s) 19.  
 
Hybrid Tea Roses.
Gustave Sobry, N. Welter, 1902, vigorous. Golden-yellow, passing to clear yellow- a lovely tint; very floriferous.

Magazine  (17 Jun 1911)  Page(s) 290.  
 
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...
Gustav Sobry... Hybrid Tea, Welter, 1901, Kaiserin Augusta Victoria X Comte Chandon

Book  (1910)  Page(s) 328.  
 
Gustave Sobry [Hybrid Tea]; flowers reddish gold shading to clear yellow, large full long buds, sweet scented; free blooming.

Book  (1909)  Page(s) 308.  
 
Gustave Sobry (H.T.). Beautiful bright yellow flowers. Very floriferous. A moderate grower. Prune moderately.

Book  (1908)  Page(s) 107.  
 
HYBRID TEA ROSES
Gustave Sobry. Welter, 1902. Golden yellow, passing to clear yellow.

Magazine  (May 1907)  Page(s) 100.  
 
THE BEST ROSES FOR OUTDOOR CULTURE By AARON WARD
Gustave Sobry (Welter 1901). A moderate grower, beautiful bright yellow flowers. Very floriferous.

Book  (1906)  Page(s) 71.  
 
4.588. Gustave Sobry, Hybride de Thé, Welter 1904 jaune nuancé