Book  (Apr 1993)  Page(s) 423.  
 
Orange Morsdag. Polyantha, deep orange, 1956, ('Orange Mothersday'); 'Mothersday' sport; Grootendorst, F.J.

Book  (Jun 1992)  Page(s) 249.  
 
Orange Morsdag (Translation, 'Orange Mother's Day') Polyantha. Grootendorst, 1956. Sport of 'Muttertag'. Orange.

Book  (1958)  Page(s) 254.  
 
New Roses of the World
Orange Morsdag (Orange Mothersday).....