Magazine  (2013)  Page(s) No. 45. p30.  
 
Harold Enders. The Conservation of Old German Roses.
....and there was the suggestion that Hinner's 'Angela Müll (1902) was really a re-issue of Welter's 'Dr. Dorothea Söffker' (1899).

Book  (Dec 2000)  Page(s) 235.  
 
Angela Müll Hybrid Tea. Wilhelm Hinner 1902

Book  (1936)  Page(s) 498.  
 
Müll, Angela (HT) Hinner 1902; yellowish white. = Dorothea Söffker

Book  (1936)  Page(s) 671.  
 
Söffker, Dorothea (HT) Welter 1899; M. van Houtte X Marie Lambert; white with cream-yellow, large, very double, fine form, opens, fragrance 5/10, floriferous, continuous bloom, long buds, lasting foliage, growth 6/10, dense. = Angela Müll

Book  (1912)  
 
White Tea Roses.
Dorothea Soffker. -- One of the finest new white roses. Globular form, full, deep and double. Roses when half open have light golden tint.

Magazine  (13 May 1911)  Page(s) 231.  
 
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...
Angela Mull... H.T., Hinner, 1902, Mrs. W. J. Grant X Baron N. de Rothschild

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...
Dorothea Soeffker... H.T., Welter, 1899, Marie Van Houtte X Mme. Lambard

Website/Catalog  (1911)  Page(s) 19.  
 
Hybrid Tea. Angela Mull. Large, full, beautiful form; color light to sulphur yellow, centre to a darker shade. Good show flower. Strong.

Magazine  (Oct 1906)  Page(s) 368.  
 
COMPTE RENDU DE L’EXPOSITION D’HORTICULTURE ET DE VITICULTURE Tenue à Lyon du 14 au 23 septembre 1906....
Et dans la collection de M. Pierre Rey : Aimée Cochet, Alliance Franco-Russe, Angela Mull, Anna Ollivier, Antoine Mermet, Antoine Rivoire, Beauté Inconstante, Capitaine Millet, Caroline Testout, Dainty, Docteur Gril, Etoile de Lyon, Georges Schwartz, Grâce Darling, Gruss an Teplitz, Jean Ducher, Jean Pernet, Kaiserin Augusta Victoria, Le Florifère, Liberty, Madame Abel Chatenay, Madame Carnot, Madame Chédanne Guinoiseau, Madame de Watteville, Madame Errera, Madame Hoste, Madame Pierre Rey (nouveauté), Maman Cochet, Mildred Grand, Madame Tillier, Papa Lambert, Perle des Jardins, Préfet Monteil, Prince de Bulgarie, Princesse Marguerite d’Orléans, Souvenir du Président Carnot, Frau Karl Druschki.

Book  (1906)  Page(s) 11, 48.  
 
708 Angela Müll HT Hinner, 1902, blanc jaunâtre syn. Dorothea Soeffker

3.185 Dorothea Soeffker HT Welter, 1899, blanc jaune

Website/Catalog  (1904)  Page(s) 116.  
 
Novelties For 1904.
Angela Mull.  A rose of very strong growth; long pointed buds, flowers large and full, of most beautiful form. Colour light to sulphur yellow, centre of a darker shade. A sport from K. A. Victoria and said to surpass even that fine variety.