Book  (Apr 1993)  Page(s) 421.  
 
Opera, Climbing Climbing Hybrid Tea, red blend, 1956, ('Grimpant Opera'); Armbrust.

Book  (1956)  Page(s) 110.  
 
Dr. A. S. Thomas. New Rose Registrations. Reg. No. 143. Clg. Opera. Clg. HT. F. Armbrust. January 13, 1956