Book  (Jan 2000)  Page(s) 70, 160.  
 
Page 70: America Herbaceous Peony. Rudolph 1976... brilliant scarlet... An improvement on its parent, 'Burma Ruby'...
Page 160: A 'Burma Ruby' cross. A single red

Book  (Jan 1999)  Page(s) 251.  
 
America Herbaceous Peony. Rudolph (USA) 1976. Single red. Improved form of 'Burma Ruby' with large, deep, brilliant scarlet petals surrounding a boss of yellow stamens... [one of the varieties the author highly recommends]