Magazine  (2001)  Page(s) 22. Vol 95, Part 1.  
 
Peter Harkness.  Favourite Singles.
Hertfordshire (KORrenay)  Ground cover shrub, 1991. .....

Book  (Dec 1998)  Page(s) 303.  Includes photo(s).
 
Hertfordshire (KORtenay, 'Tommelise') Description... During several years of trials for disease resistance at The Gardens of the Rose in England, conducted without spray protection, 'Hertfordshire' emerged with an unblemished record for good health... small, single, flat, carmine-pink flowers with pale centers, displaying attractive stamens...

Website/Catalog  (23 Oct 1998)  Page(s) 5.  Includes photo(s).
 
Hertfordshire (KOPtenay) County Series. Carmine pink single blooms... Kordes 1991.

Book  (1997)  Page(s) 324.  
 
Hertfordshire (KORtenay) Description... single, carmine blooms borne in great profusion...

Book  (1996)  Page(s) 44.  
 
Hertfordshire (KORtenay) Ground cover shrub; masses of 1.75 in (4.5 cm) single flat carmine pink flowers, with pale centres... Kordes (Germany) 1991.

Book  (1996)  Page(s) 39.  Includes photo(s).
 
Hertfordshire (KORtenay) Ground-cover shruv... this rose keeps close to the soil at first, acquiring a humped appearance as new shoots grow over the old ones... simple carmine-pink roses showing pale centres... Kordes 1991