Book  (Apr 1993)  Page(s) 166.  
 
Etty van Best Hybrid Tea, Flowers white, shaded yellow [ly], 1934, 'Pharisaer' x 'Souv. de H.A. Verschuren'; Buisman.

Book  (1936)  Page(s) 74.  
 
van Best, Ebby (HT) Buisman 1934; Pharisäer X Sv. H. A. Verschuren; white, shaded yellow, double, lasting, floriferous, leathery foliage, ovoid buds, growth 5/10, short. Sangerhausen