Book  (Apr 1993)  Page(s) 163.  
 
Esperanto Hybrid Tea, Flowers pure yellow [my], 1932, 'Miss Lolita Armour' sport; Böhm.

Book  (1940)  Page(s) 23.  
 
Jan Böhm, Blatna-Cechy, Czechoslovakia. 'Esperanto'

Book  (1936)  Page(s) 242.  
 
Esperanto (hybrid lutea) Böhm 1922; sport of M. Lol. Armour; pure yellow, very large, double, globular, lasting, bud ovoid, fragrance 7/10, floriferous with interruptions, glossy bronze-green foliage, growth 6/10, bushy. Sangerhausen