Book  (Apr 1993)  Page(s) 21.  
 
Anneke Koster Polyantha, deep red, 1927, 'Greta Kluis' sport; Koster, D.A.

Book  (1958)  Page(s) 12.  
 
Anneke Koster. Pol. (D. A. Koster, '27.) Deep sport of Greta Kluis.

Magazine  (1941)  Page(s) 72.  
 
Named Sports of Crimson Rambler Progeny
Anneke Koster, Poly, Parent: Präsident Hindenburg

Website/Catalog  (1938)  Page(s) 17.  
 
Anneke Koster (Koster 30). Magnificent dark-red, well double, rounded bloom, short habit.

Book  (1936)  Page(s) 391.  
 
Koster, Anneke (polyantha) Koster 1930; sport of Präs. Hindenburg; dark currant-red, small, well double, rosette-form, in clusters of 10-25; floriferous, continuous bloom, growth 5/10, upright, bushy. Sangerhausen