Book  (1978)  Page(s) 98.  
 
p98. Sam McGredy. A Hand-Painted Family Tree. ....I can thank my eyes for picking out an unusual flower in 1963. Some eight years earlier I had made a fair family of crosses with 'Fruhlingsmorgen' as a parent, not in the search for novel colour, but in a general quest for hardiness. The resulting seedlings were all shrub by types with nothing immediately outstanding amongst them. I decided to plant them out in my home garden and let them develop for a year or two to see how they survived the winter. Late in the '63 breeding season I was attracted to one particular plant which had rather dull pink flowers with a marked white edge to each petal. I put a handful of flowers in my coat pocket of the variety, MACashpi....

p101. Breeding chart which shows the parentage of MACashpi: 'Orange Sweetheart' x Fruhlingsmorgen'