Book  (Apr 1993)  Page(s) 448.  
 
Pierrette Hybrid Tea, blackish red streaked white, passing to steel-blue, 1931, 'Felix Laporte' sport; Tantau. Description.

Book  (1936)  Page(s) 563.  
 
Pierrette (HT) Tantau 1931; sport of F. Laporte; blackish red, striped white, fades to steel-blue, small, double, cup form, lasting, solitary or up to 3, fragrance 3/10, floriferousm continuous bloom, growth 5/10, short. Sangerhausen