Book  (Apr 1993)  Page(s) 351.  
 
Mandalay Hybrid Tea, medium yellow, 1942, ('Helvétia'); 'Soeur Thérèse' x 'Feu Joseph Looymans'; Mallerin. Description.

Website/Catalog  (1960)  Page(s) 15.  
 
HELVETIA (Mallerin 1941). Jaune citron, bouton allongé. VH [grande végétation]. 

[no longer listed in 1975]

Book  (1958)  Page(s) 217.  
 
Mandalay (Helvétia in Europe). HT. (Mallerin; int. A. Meilland, also J&P, '42.) Sœur Thérèse X Feu Joseph Looymans. Very large (6 in.), dbl. (40 petals), open, fragrant, clear yellow; long stem. Fol. leathery. Very vig., upright; free bloom. (28) Pl. Pat. 775.

Book  (1958)  Page(s) 154.  
 
Helvétia. Named used in Europe for Mandalay.

Book  (1953)  Page(s) 76.  
 
Dr. A. S. Thomas.  Yellow Roses.
Helvetia and Quebec, two fairly new roses, are probably the best of this group — beautifully formed flowers, a little brighter in colour than the others and their plants are almost ideal in habit.

Magazine  (Feb 1951)  Page(s) 1. trimester, p. 23.  
 
Registration internationale de roses nouvelles...
Nom original  Helvetia
Nom modifié  Mandalay

Book  (1951)  Page(s) 135.  
 
Dr. A. S. Thomas.  An Outstanding Year for Novelties
Helvetia: An excellent show bloom of light yellow to sunflower colouring with thick petals that reflex nicely. Produced freely on a strong plant. In America this rose is being sold as ''Mandalay,' a travesty which should be expected to force Rudyard Kipling into resurrection and reconsideration of his "East is East and West is West and never the twain shall meet."

Book  (1951)  Page(s) 45.  
 
Rose Nomenclature 
By the Editor
As no doubt some of our members are aware, a very unsatisfactory situation with respect to Rose names has arisen within the past few years due to the practice of certain large commercial firms in re-naming Roses of European origin, contrary to and in defiance of "International Rules of Botanical Nomenclature" and its supplementary schedule known as Appendix VII (Nomenclature of Garden Plants).
Valid Name: Helvetia
Re-christened: Mandalay

Book  (1950)  Page(s) 14.  
 
Harry H. Hazlewood. The New Roses of 1950. 
Helvetia HT. (Mallerin, 1942). This is the best clear yellow of the year and with  'Diamond Jubilee ' sets a high exhibition standard. The plants are vigorous and produce their blooms on long stems.  Its original and valid name is retained here as it has been changed, contrary to all rules, to 'Mandalay' in U.S.A.

Website/Catalog  (1950)  Page(s) 5.  
 
Novelty Roses 1950. Helvetia (H.T.) (Mallerin 1942). Large double blooms of clear sun-flower yellow borne on long stems. Contrary to International Rules, it was renamed Mandalay in U.S.A. Vigorous growth. The best clear yellow of the year. 10/6 each.