Book  (Apr 1999)  Page(s) 456, 555.  
 
P. 456: Adolf Kärger ('Adolphe Kärzer') Pernetiana. Kordes 1918. The author cites information from different sources... Yellow, very large... Chrome yellow...
P. 555: Adolf Kärger Pernetiana. Wilhelm Kordes 1918

Book  (Apr 1993)  Page(s) 3.  
 
Hybrid Tea, medium yellow, 1918, 'Cissie Easlea' x 'Sunburst'; Kordes, H. Flowers golden yellow, fading; slightly fragrant.

Book  (1976)  Page(s) 7.  
 
Adolf Kärger (H. Kordes 1918) hybrid lutea, yellow, very large, double, moderate fragrance, medium height

Book  (1940)  Page(s) 3.  
 
Adolf Kärger Hybrid Tea. (Kordes, '18)... golden yellow, fading lighter in full sun.

Book  (1936)  Page(s) 381.  
 
Kärger, Adolf (hybrid lutea) Kordes 1918; C. Easlea X Sunburst; light golden-yellow, cemter whitish yellow, very large, double, high-centered, lasting, solitary, fragrance 5/10, floriferous, continuous bloom, long stems, growth 6/10, bushy, Sangerhausen

Website/Catalog  (1927)  Page(s) 84.  
 
Adolf Kärger (1918), chrome-yellow, sufficiently double on strong canes, floriferous, dark green foliage. Cutting and forcing rose, good autumn-bloomer (Pernet). 1 piece M -.80, 10 pieces M 7.-, 100 pieces M 65.-

Website/Catalog  (1926)  Page(s) 92.  
 
Adolf Kärger (1918) (Pernetiana). Fl. jaune de chrome sans autre nuance, gr., pl., bouton long, très florifè« bonne rose à couper et de premier mérite

Website/Catalog  (1926)  Page(s) 73-74.  
 
Hybrid Teas. Adolf Kärger Hybrid Lutea. (W. Kordes 1918). Extraordinarily faithful bloomer, even in October she produces numerous good, very long-stalked blooms. Elongated bud, sometimes almost 8-10 cm long, well double, excellent form, pure deep yellow, without any side tones. Just this beautiful, pure colour makes this rose very attractive. Large, deep green and totally disease-free foliage. Upright, vigorous, long stems.

Website/Catalog  (1925)  Page(s) 7.  
 
Adolf Kärger, 1918 (Pernetiana), silvery yellow, floriferous also in autumn

Website/Catalog  (1924)  Page(s) 54.  
 
Yellow and orange...Adolf Kärger, pure yellow, forcing sort