Book  (1936)  Page(s) 559.  
 
Peter, Josef (HT) Ketten 1929; Ruth X Fr. W. Dunlop; white with pink reflexes, reverse mallow-pink, very large, well double, ovoid, solitary, fragrance 7/10, floriferous, continuous bloom, growth 6/10, upright, well-branched. Sangerhausen