Book  (Apr 1993)  Page(s) 356.  
 
Margo Koster Superior Polyantha, deep salmon-pink, 1956, 'Dick Koster' sport; Koster, D.A.

Book  (1958)  Page(s) 220.  
 
Margo Koster Superior. Pol. (D. A. Koster, '56.) Deep salmon-pink sport of Dick Koster. (14)