Article (magazine)  (Jan 1955)  Page(s) 59.  
 
Alphabetical Check List of Tree Peony Names In  Public Collections And/or Available in Nurseries 1954-1955
Japanese, Scarlet, 'Riu-shiko' (Shiko Dargon) (Jap. bef. 1900), [Gardens] Scott Foundation, John J. Tyler Arboretum