Book  (1940)  Page(s) 7, 19.  
 
Page 7: Althea Hybrid Tea. (Pemberton; introduced by Bentall 1930.) Old Damask fragrance, glowing amaranth.
Page 19: J.A. Bentall, Havering, Romford, Essex, England. (Successor to J.H. Pemberton.) 'Althea'

Book  (1936)  Page(s) 16.  
 
Althea (HT) Pemberton 1930; glowing amaranth-carmine, large, double, fragrance 7/10 (damask), floriferous, continuous bloom, large elongated pointed buds, leathery foliage, growth 6/10, upright, bushy, hardy, 70 cm. Sangerhausen