Book  (Apr 1993)  Page(s) 472.  
 
Princess Nagaka Hybrid Tea, fiery red, shaded yellow, 1922, Pemberton...

Book  (1936)  Page(s) 504.  
 
Nagako, Princess (HT) Pemberton 1922; fire-red, shaded yellow, small, semi-double, cup form, solitary, fragrance 6/10, continuous bloom, short stems, many prickles, small glossy light green foliage, growth 4/10, short. Sangerhausen

Book  (1923)  Page(s) 149.  
 
Princess Nagako, H.T. (Pemberton, 1922.) Bud small, globular; flower small, cupped, semi-double; fiery red, shaded yellow; borne singly on short stem; slight fragrance. Foliage sufficient, small, glossy, light green, disease-resistant. Many thorns. Moderate grower, dwarf; continuous bloomer; hardy.

Book  (1922)  Page(s) 224.  
 
Princess Nagako (Hybrid China). Colour fire shaded yellow, distinct. Form globular, medium size, semi-double. Habit dwarf, free flowering, suitable for bedding. Blooming continuously from early summer to October.