Book  (Apr 1993)  Page(s) 416.  
 
Nypels Perfection Polyantha, hydrangea-pink, shaded deep pink, 1930, Leenders, M. Description.

Book  (1993)  Page(s) 98.  Includes photo(s).
 
Polyantha. Description. Leenders (The Netherlands) 1930. Repeat. Height: 2 ft. Little scent.

Photographed in David Austin's garden at Albrighton, Shropshire.

Book  (Jun 1992)  Page(s) 249.  
 
Nypels Perfection Polyantha. Leenders, 1930. Sport of 'Mevrouw Nathalie Nypels'. Description.

Website/Catalog  (1938)  Page(s) 45.  
 
Polyantha and their Hybrids (Dwarf Bedding Types)
No pruning necessary except to remove the past season's flower stems.
Nypels Perfection... A deeper and brighter coloured form of above [Nathalie Nypels]; very fine.

Book  (1936)  Page(s) 519.  
 
Nypels Perfection (polyantha) M. Leenders 1930; sport of above [Mevrouw Nathalie Nypels]; Nyron-pink, shaded red, violet spots and highlights, otherwise as above. Sangerhausen

Book  (1932)  Page(s) 172.  
 
...1931 awards at the National Rose Society's Test Garden at Hayward Heath. 
First Class Trial-Ground Cerificate.
Oonagh Anderson, HT., ( S . McGredy & Son , Portadown ); W. A. Bilney (HT., W. Easlea & Sons, Eastwood, Essex); Patrick C. Bruce, HT., McGredy's Yellow, and Fred Walter, HT., (S. McGredy & Son, Portadown); ...Nypels Perfection, H. Poly., ( M. Leenders & Co., SteylTegelen, Holland ) ; Annie Brandt , HT., (H. Guillot  Saint - Marcellin, Isère, France .