Book  (1936)  Page(s) 216-217.  Includes photo(s).
 
Black and white photo opposite p. 180
Proof In the Pudding describes Susan Louise grown at Breeze Hill, freezing back every winter and growing back.

Book  (1936)  Page(s) 689.  
 
Susan Louise (hybrid gigantea) Adams 1929 [Stocking]; Belle de Portugal X ? ; flesh-pink, medium size, semi-double, lasting, solitary, fragrance 3/10, very floriferous, repeats well, growth 6/10, upright, bushy, 1 m. Sangerhausen

Book  (1935)  Page(s) 204.  
 
Proof in the Pudding- notes that Susan Louise was initially released as a Hybrid Tea.