Book  (Sep 1993)  Page(s) 237.  Includes photo(s).
 
Katherine Loker Cluster-flowered... Both this rose's parents are best known as greenhouse roses, and it seems their offspring 'Katherine Loker' is also best as a greenhouse florist's rose, except in very warm climates...

Book  (Apr 1993)  Page(s) 285.  
 
Katherine Loker Floribunda, medium goldenyellow, 1978, (AROkr); 'Zorina' x 'Dr. A.J. Verhage'; Swim & Christensen. Description.