Book  (Jan 2000)  Page(s) 236.  
 
Gold Finch Hybrid Tree Poeny (Saunders 1948). A single yellow hybrid

Article (magazine)  (Jan 1955)  Page(s) 24.  
 
Varieties Raised in America. All by Professor Saunders...
The "Roman Gold Group." Yellow, clear or almost clear , generally single.
'Goldfinch,' (1948-1950)

Article (magazine)  (Jan 1955)  Page(s) 57.  
 
Alphabetical Check List of Tree Peony Names In  Public Collections And/or Available in Nurseries 1954-1955
Lutea hybrid, Yellow, 'Goldfinch' (Saund. 1948-1950)