Book  (Apr 1999)  Page(s) 364.  
 
Callisto Hybrid Musk. Pemberton 1920. Seedling of 'William Allen Richardson' (Noisette) The author cites information from different sources... Golden-yellow rosettes...

Book  (1936)  Page(s) 121.  
 
Callisto (hybrid moschata) Pemberton 1920; golden-yellow, small, double, rosette-form, lasting, clusters along the canes, floriferous, continuous bloom, autumn-bloomer, growth 6/10, climbing, 1 m., hardy. Sangerhausen

Book  (1933)  Page(s) 165.  
 
CALLISTO. The Rev. J. H. Pemberton, 1920. None of these Musk hybrids are much more than big shrubs. This one has clusters of yellow flowers throughout the season.

Magazine  (30 Sep 1922)  Page(s) 487.  
 
A Trial of New Roses
British Introductions of 1920.
Callisto (Hybrid Musk, J. H. Pemberton).—A strong grower, with branching habit. Small clusters of pale yellow blooms of rosette shape. Summer flowering only. Should be grown as a bush Rose, and is hardly suitable as a bedding variety.

Book  (1921)  Page(s) 158.  
 
Callisto

Book  (1918)  Page(s) 139.  
 
J. R. Ramsbottom. Single Hybrid Tea Roses And Their Decorative Value.
....the variety 'Queen Alexandra' - introduced recently by the Rev. J. H. Pemberton - which is excellent for pillars, and is a perpetual flowerer. The blooms are perfectly single, reminding one of a glorified Dog-Rose; the colour is pale citron-yellow flushed with pink when young, and fading with age to white. The same raiser has also given us 'Danae', soft yellow; 'Moonlight', lemon white; Callisto pale yellow; and 'Clytemnestra', salmon yellow; all semi-double flowers borne in large clusters and suitable for small pillars.

Book  (1917)  Page(s) 147.  
 
Pemberton's advertisement. 
New Seedling Rose 1917. 
Callisto (Hybrid   Tea).   A   yellow perpetual  flowering cluster Rose.    Flowering throughout  the  season to the middle of October. Good in autumn,   of bush  habit,  growing  about  three feet high.    Award of  Merit R.H.S.,   September, 1916.   Ground  Plants  in autumn, 1917.    7/6 each. 

Opinions of the Press.
The  Gardeners'  Chronicle  says: Rose Callisto.  A  very free-flowering  H.T. variety.  The   small, soft yellow, very fragrant  blooms are borne in clusters on stout stems which have  prominent red spines.    This variety  has a general   resemblance  to Clarissa  though   the flowers   have usually more petals and  the colour is more  pronounced.   The foliage is dark green and glossy."—September 2nd,  1916. 

The  Garden   observes: Rose Callisto.  A  new  seedling perpetual-flowering cluster Rose of  much  beauty   and  charm,  and one of  a type which the  Rev. J.  H. Pemberton  has made    very  much his  own  during recent years.  The new-corner is of  soft canary and primrose yellow tone, the abundance  of the flowers rendering it most welcome."—September   9th, 1916.